func_str.result
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:46k
- drop table if exists t1;
- set names latin1;
- select 'hello',"'hello'",'""hello""','''h''e''l''l''o''',"hel""lo",'hel'lo';
- hello 'hello' ""hello"" 'h'e'l'l'o' hel"lo hel'lo
- hello 'hello' ""hello"" 'h'e'l'l'o' hel"lo hel'lo
- select 'hello' 'monty';
- hello
- hellomonty
- select length('ntrb _%\');
- length('ntrb _%\')
- 10
- select bit_length('ntrb _%\');
- bit_length('ntrb _%\')
- 80
- select char_length('ntrb _%\');
- char_length('ntrb _%\')
- 10
- select length(_latin1'ntnb \_\%\');
- length(_latin1'ntnb \_\%\')
- 10
- select concat('monty',' was here ','again'),length('hello'),char(ascii('h')),ord('h');
- concat('monty',' was here ','again') length('hello') char(ascii('h')) ord('h')
- monty was here again 5 h 104
- select locate('he','hello'),locate('he','hello',2),locate('lo','hello',2) ;
- locate('he','hello') locate('he','hello',2) locate('lo','hello',2)
- 1 0 4
- select instr('hello','HE'), instr('hello',binary 'HE'), instr(binary 'hello','HE');
- instr('hello','HE') instr('hello',binary 'HE') instr(binary 'hello','HE')
- 1 0 0
- select position(binary 'll' in 'hello'),position('a' in binary 'hello');
- position(binary 'll' in 'hello') position('a' in binary 'hello')
- 3 0
- select left('hello',2),right('hello',2),substring('hello',2,2),mid('hello',1,5) ;
- left('hello',2) right('hello',2) substring('hello',2,2) mid('hello',1,5)
- he lo el hello
- select concat('',left(right(concat('what ',concat('is ','happening')),9),4),'',substring('monty',5,1)) ;
- concat('',left(right(concat('what ',concat('is ','happening')),9),4),'',substring('monty',5,1))
- happy
- select substring_index('www.tcx.se','.',-2),substring_index('www.tcx.se','.',1);
- substring_index('www.tcx.se','.',-2) substring_index('www.tcx.se','.',1)
- tcx.se www
- select substring_index('www.tcx.se','tcx',1),substring_index('www.tcx.se','tcx',-1);
- substring_index('www.tcx.se','tcx',1) substring_index('www.tcx.se','tcx',-1)
- www. .se
- select substring_index('.tcx.se','.',-2),substring_index('.tcx.se','.tcx',-1);
- substring_index('.tcx.se','.',-2) substring_index('.tcx.se','.tcx',-1)
- tcx.se .se
- select substring_index('aaaaaaaaa1','a',1);
- substring_index('aaaaaaaaa1','a',1)
- select substring_index('aaaaaaaaa1','aa',1);
- substring_index('aaaaaaaaa1','aa',1)
- select substring_index('aaaaaaaaa1','aa',2);
- substring_index('aaaaaaaaa1','aa',2)
- aa
- select substring_index('aaaaaaaaa1','aa',3);
- substring_index('aaaaaaaaa1','aa',3)
- aaaa
- select substring_index('aaaaaaaaa1','aa',4);
- substring_index('aaaaaaaaa1','aa',4)
- aaaaaa
- select substring_index('aaaaaaaaa1','aa',5);
- substring_index('aaaaaaaaa1','aa',5)
- aaaaaaaaa1
- select substring_index('aaaaaaaaa1','aaa',1);
- substring_index('aaaaaaaaa1','aaa',1)
- select substring_index('aaaaaaaaa1','aaa',2);
- substring_index('aaaaaaaaa1','aaa',2)
- aaa
- select substring_index('aaaaaaaaa1','aaa',3);
- substring_index('aaaaaaaaa1','aaa',3)
- aaaaaa
- select substring_index('aaaaaaaaa1','aaa',4);
- substring_index('aaaaaaaaa1','aaa',4)
- aaaaaaaaa1
- select substring_index('aaaaaaaaa1','aaaa',1);
- substring_index('aaaaaaaaa1','aaaa',1)
- select substring_index('aaaaaaaaa1','aaaa',2);
- substring_index('aaaaaaaaa1','aaaa',2)
- aaaa
- select substring_index('aaaaaaaaa1','1',1);
- substring_index('aaaaaaaaa1','1',1)
- aaaaaaaaa
- select substring_index('aaaaaaaaa1','a',-1);
- substring_index('aaaaaaaaa1','a',-1)
- 1
- select substring_index('aaaaaaaaa1','aa',-1);
- substring_index('aaaaaaaaa1','aa',-1)
- 1
- select substring_index('aaaaaaaaa1','aa',-2);
- substring_index('aaaaaaaaa1','aa',-2)
- aa1
- select substring_index('aaaaaaaaa1','aa',-3);
- substring_index('aaaaaaaaa1','aa',-3)
- aaaa1
- select substring_index('aaaaaaaaa1','aa',-4);
- substring_index('aaaaaaaaa1','aa',-4)
- aaaaaa1
- select substring_index('aaaaaaaaa1','aa',-5);
- substring_index('aaaaaaaaa1','aa',-5)
- aaaaaaaaa1
- select substring_index('aaaaaaaaa1','aaa',-1);
- substring_index('aaaaaaaaa1','aaa',-1)
- 1
- select substring_index('aaaaaaaaa1','aaa',-2);
- substring_index('aaaaaaaaa1','aaa',-2)
- aaa1
- select substring_index('aaaaaaaaa1','aaa',-3);
- substring_index('aaaaaaaaa1','aaa',-3)
- aaaaaa1
- select substring_index('aaaaaaaaa1','aaa',-4);
- substring_index('aaaaaaaaa1','aaa',-4)
- select substring_index('the king of thethe hill','the',-2);
- substring_index('the king of thethe hill','the',-2)
- the hill
- select substring_index('the king of the the hill','the',-2);
- substring_index('the king of the the hill','the',-2)
- the hill
- select substring_index('the king of the the hill','the',-2);
- substring_index('the king of the the hill','the',-2)
- the hill
- select substring_index('the king of the the hill',' the ',-1);
- substring_index('the king of the the hill',' the ',-1)
- hill
- select substring_index('the king of the the hill',' the ',-2);
- substring_index('the king of the the hill',' the ',-2)
- the hill
- select substring_index('the king of the the hill',' ',-1);
- substring_index('the king of the the hill',' ',-1)
- hill
- select substring_index('the king of the the hill',' ',-2);
- substring_index('the king of the the hill',' ',-2)
- the hill
- select substring_index('the king of the the hill',' ',-3);
- substring_index('the king of the the hill',' ',-3)
- the hill
- select substring_index('the king of the the hill',' ',-4);
- substring_index('the king of the the hill',' ',-4)
- the the hill
- select substring_index('the king of the the hill',' ',-5);
- substring_index('the king of the the hill',' ',-5)
- of the the hill
- select substring_index('the king of the.the hill','the',-2);
- substring_index('the king of the.the hill','the',-2)
- .the hill
- select substring_index('the king of thethethe.the hill','the',-3);
- substring_index('the king of thethethe.the hill','the',-3)
- the.the hill
- select substring_index('the king of thethethe.the hill','the',-1);
- substring_index('the king of thethethe.the hill','the',-1)
- hill
- select substring_index('the king of the the hill','the',1);
- substring_index('the king of the the hill','the',1)
- select substring_index('the king of the the hill','the',2);
- substring_index('the king of the the hill','the',2)
- the king of
- select substring_index('the king of the the hill','the',3);
- substring_index('the king of the the hill','the',3)
- the king of the
- select concat(':',ltrim(' left '),':',rtrim(' right '),':');
- concat(':',ltrim(' left '),':',rtrim(' right '),':')
- :left : right:
- select concat(':',trim(LEADING FROM ' left'),':',trim(TRAILING FROM ' right '),':');
- concat(':',trim(LEADING FROM ' left'),':',trim(TRAILING FROM ' right '),':')
- :left: right:
- select concat(':',trim(' m '),':',trim(BOTH FROM ' y '),':',trim('*' FROM '*s*'),':');
- concat(':',trim(' m '),':',trim(BOTH FROM ' y '),':',trim('*' FROM '*s*'),':')
- :m:y:s:
- select concat(':',trim(BOTH 'ab' FROM 'ababmyabab'),':',trim(BOTH '*' FROM '***sql'),':');
- concat(':',trim(BOTH 'ab' FROM 'ababmyabab'),':',trim(BOTH '*' FROM '***sql'),':')
- :my:sql:
- select concat(':',trim(LEADING '.*' FROM '.*my'),':',trim(TRAILING '.*' FROM 'sql.*.*'),':');
- concat(':',trim(LEADING '.*' FROM '.*my'),':',trim(TRAILING '.*' FROM 'sql.*.*'),':')
- :my:sql:
- select TRIM("foo" FROM "foo"), TRIM("foo" FROM "foook"), TRIM("foo" FROM "okfoo");
- TRIM("foo" FROM "foo") TRIM("foo" FROM "foook") TRIM("foo" FROM "okfoo")
- ok ok
- select concat_ws(', ','monty','was here','again');
- concat_ws(', ','monty','was here','again')
- monty, was here, again
- select concat_ws(NULL,'a'),concat_ws(',',NULL,'');
- concat_ws(NULL,'a') concat_ws(',',NULL,'')
- NULL
- select concat_ws(',','',NULL,'a');
- concat_ws(',','',NULL,'a')
- ,a
- SELECT CONCAT('"',CONCAT_WS('";"',repeat('a',60),repeat('b',60),repeat('c',60),repeat('d',100)), '"');
- CONCAT('"',CONCAT_WS('";"',repeat('a',60),repeat('b',60),repeat('c',60),repeat('d',100)), '"')
- "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";"cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc";"dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd"
- select insert('txs',2,1,'hi'),insert('is ',4,0,'a'),insert('txxxxt',2,4,'es');
- insert('txs',2,1,'hi') insert('is ',4,0,'a') insert('txxxxt',2,4,'es')
- this is a test
- select replace('aaaa','a','b'),replace('aaaa','aa','b'),replace('aaaa','a','bb'),replace('aaaa','','b'),replace('bbbb','a','c');
- replace('aaaa','a','b') replace('aaaa','aa','b') replace('aaaa','a','bb') replace('aaaa','','b') replace('bbbb','a','c')
- bbbb bb bbbbbbbb aaaa bbbb
- select replace(concat(lcase(concat('THIS',' ','IS',' ','A',' ')),ucase('false'),' ','test'),'FALSE','REAL') ;
- replace(concat(lcase(concat('THIS',' ','IS',' ','A',' ')),ucase('false'),' ','test'),'FALSE','REAL')
- this is a REAL test
- select soundex(''),soundex('he'),soundex('hello all folks'),soundex('#3556 in bugdb');
- soundex('') soundex('he') soundex('hello all folks') soundex('#3556 in bugdb')
- H000 H4142 I51231
- select 'mood' sounds like 'mud';
- 'mood' sounds like 'mud'
- 1
- select 'Glazgo' sounds like 'Liverpool';
- 'Glazgo' sounds like 'Liverpool'
- 0
- select null sounds like 'null';
- null sounds like 'null'
- NULL
- select 'null' sounds like null;
- 'null' sounds like null
- NULL
- select null sounds like null;
- null sounds like null
- NULL
- select md5('hello');
- md5('hello')
- 5d41402abc4b2a76b9719d911017c592
- select crc32("123");
- crc32("123")
- 2286445522
- select sha('abc');
- sha('abc')
- a9993e364706816aba3e25717850c26c9cd0d89d
- select sha1('abc');
- sha1('abc')
- a9993e364706816aba3e25717850c26c9cd0d89d
- select aes_decrypt(aes_encrypt('abc','1'),'1');
- aes_decrypt(aes_encrypt('abc','1'),'1')
- abc
- select aes_decrypt(aes_encrypt('abc','1'),1);
- aes_decrypt(aes_encrypt('abc','1'),1)
- abc
- select aes_encrypt(NULL,"a");
- aes_encrypt(NULL,"a")
- NULL
- select aes_encrypt("a",NULL);
- aes_encrypt("a",NULL)
- NULL
- select aes_decrypt(NULL,"a");
- aes_decrypt(NULL,"a")
- NULL
- select aes_decrypt("a",NULL);
- aes_decrypt("a",NULL)
- NULL
- select aes_decrypt("a","a");
- aes_decrypt("a","a")
- NULL
- select aes_decrypt(aes_encrypt("","a"),"a");
- aes_decrypt(aes_encrypt("","a"),"a")
- select repeat('monty',5),concat('*',space(5),'*');
- repeat('monty',5) concat('*',space(5),'*')
- montymontymontymontymonty * *
- select reverse('abc'),reverse('abcd');
- reverse('abc') reverse('abcd')
- cba dcba
- select rpad('a',4,'1'),rpad('a',4,'12'),rpad('abcd',3,'12'), rpad(11, 10 , 22), rpad("ab", 10, 22);
- rpad('a',4,'1') rpad('a',4,'12') rpad('abcd',3,'12') rpad(11, 10 , 22) rpad("ab", 10, 22)
- a111 a121 abc 1122222222 ab22222222
- select lpad('a',4,'1'),lpad('a',4,'12'),lpad('abcd',3,'12'), lpad(11, 10 , 22);
- lpad('a',4,'1') lpad('a',4,'12') lpad('abcd',3,'12') lpad(11, 10 , 22)
- 111a 121a abc 2222222211
- select rpad(741653838,17,'0'),lpad(741653838,17,'0');
- rpad(741653838,17,'0') lpad(741653838,17,'0')
- 74165383800000000 00000000741653838
- select rpad('abcd',7,'ab'),lpad('abcd',7,'ab');
- rpad('abcd',7,'ab') lpad('abcd',7,'ab')
- abcdaba abaabcd
- select rpad('abcd',1,'ab'),lpad('abcd',1,'ab');
- rpad('abcd',1,'ab') lpad('abcd',1,'ab')
- a a
- select rpad('STRING', 20, CONCAT('p','a','d') );
- rpad('STRING', 20, CONCAT('p','a','d') )
- STRINGpadpadpadpadpa
- select lpad('STRING', 20, CONCAT('p','a','d') );
- lpad('STRING', 20, CONCAT('p','a','d') )
- padpadpadpadpaSTRING
- select LEAST(NULL,'HARRY','HARRIOT',NULL,'HAROLD'),GREATEST(NULL,'HARRY','HARRIOT',NULL,'HAROLD');
- LEAST(NULL,'HARRY','HARRIOT',NULL,'HAROLD') GREATEST(NULL,'HARRY','HARRIOT',NULL,'HAROLD')
- HAROLD HARRY
- select least(1,2,3) | greatest(16,32,8), least(5,4)*1,greatest(-1.0,1.0)*1,least(3,2,1)*1.0,greatest(1,1.1,1.0),least("10",9),greatest("A","B","0");
- least(1,2,3) | greatest(16,32,8) least(5,4)*1 greatest(-1.0,1.0)*1 least(3,2,1)*1.0 greatest(1,1.1,1.0) least("10",9) greatest("A","B","0")
- 33 4 1.0 1.0 1.1 9 B
- select decode(encode(repeat("a",100000),"monty"),"monty")=repeat("a",100000);
- decode(encode(repeat("a",100000),"monty"),"monty")=repeat("a",100000)
- 1
- select decode(encode("abcdef","monty"),"monty")="abcdef";
- decode(encode("abcdef","monty"),"monty")="abcdef"
- 1
- select quote(''"\test');
- quote(''"\test')
- ''"\test'
- select quote(concat('abc'', '\cba'));
- quote(concat('abc'', '\cba'))
- 'abc'\cba'
- select quote(1/0), quote(' Z');
- quote(1/0) quote(' Z')
- NULL ' Z'
- select length(quote(concat(char(0),"test")));
- length(quote(concat(char(0),"test")))
- 8
- select hex(quote(concat(char(224),char(227),char(230),char(231),char(232),char(234),char(235))));
- hex(quote(concat(char(224),char(227),char(230),char(231),char(232),char(234),char(235))))
- 27E0E3E6E7E8EAEB27
- select unhex(hex("foobar")), hex(unhex("1234567890ABCDEF")), unhex("345678"), unhex(NULL);
- unhex(hex("foobar")) hex(unhex("1234567890ABCDEF")) unhex("345678") unhex(NULL)
- foobar 1234567890ABCDEF 4Vx NULL
- select hex(unhex("1")), hex(unhex("12")), hex(unhex("123")), hex(unhex("1234")), hex(unhex("12345")), hex(unhex("123456"));
- hex(unhex("1")) hex(unhex("12")) hex(unhex("123")) hex(unhex("1234")) hex(unhex("12345")) hex(unhex("123456"))
- 01 12 0123 1234 012345 123456
- select length(unhex(md5("abrakadabra")));
- length(unhex(md5("abrakadabra")))
- 16
- select concat('a', quote(NULL));
- concat('a', quote(NULL))
- aNULL
- select reverse("");
- reverse("")
- select insert("aa",100,1,"b"),insert("aa",1,3,"b"),left("aa",-1),substring("a",1,2);
- insert("aa",100,1,"b") insert("aa",1,3,"b") left("aa",-1) substring("a",1,2)
- aa b a
- select elt(2,1),field(NULL,"a","b","c"),reverse("");
- elt(2,1) field(NULL,"a","b","c") reverse("")
- NULL 0
- select locate("a","b",2),locate("","a",1);
- locate("a","b",2) locate("","a",1)
- 0 1
- select ltrim("a"),rtrim("a"),trim(BOTH "" from "a"),trim(BOTH " " from "a");
- ltrim("a") rtrim("a") trim(BOTH "" from "a") trim(BOTH " " from "a")
- a a a a
- select concat("1","2")|0,concat("1",".5")+0.0;
- concat("1","2")|0 concat("1",".5")+0.0
- 12 1.5
- select substring_index("www.tcx.se","",3);
- substring_index("www.tcx.se","",3)
- select length(repeat("a",100000000)),length(repeat("a",1000*64));
- length(repeat("a",100000000)) length(repeat("a",1000*64))
- NULL 64000
- Warnings:
- Warning 1301 Result of repeat() was larger than max_allowed_packet (1048576) - truncated
- select position("0" in "baaa" in (1)),position("0" in "1" in (1,2,3)),position("sql" in ("mysql"));
- position("0" in "baaa" in (1)) position("0" in "1" in (1,2,3)) position("sql" in ("mysql"))
- 1 0 3
- select position(("1" in (1,2,3)) in "01");
- position(("1" in (1,2,3)) in "01")
- 2
- select length(repeat("a",65500)),length(concat(repeat("a",32000),repeat("a",32000))),length(replace("aaaaa","a",concat(repeat("a",10000)))),length(insert(repeat("a",40000),1,30000,repeat("b",50000)));
- length(repeat("a",65500)) length(concat(repeat("a",32000),repeat("a",32000))) length(replace("aaaaa","a",concat(repeat("a",10000)))) length(insert(repeat("a",40000),1,30000,repeat("b",50000)))
- 65500 64000 50000 60000
- select length(repeat("a",1000000)),length(concat(repeat("a",32000),repeat("a",32000),repeat("a",32000))),length(replace("aaaaa","a",concat(repeat("a",32000)))),length(insert(repeat("a",48000),1,1000,repeat("a",48000)));
- length(repeat("a",1000000)) length(concat(repeat("a",32000),repeat("a",32000),repeat("a",32000))) length(replace("aaaaa","a",concat(repeat("a",32000)))) length(insert(repeat("a",48000),1,1000,repeat("a",48000)))
- 1000000 96000 160000 95000
- create table t1 ( domain char(50) );
- insert into t1 VALUES ("hello.de" ), ("test.de" );
- select domain from t1 where concat('@', trim(leading '.' from concat('.', domain))) = '@hello.de';
- domain
- hello.de
- select domain from t1 where concat('@', trim(leading '.' from concat('.', domain))) = '@test.de';
- domain
- test.de
- drop table t1;
- CREATE TABLE t1 (
- id int(10) unsigned NOT NULL,
- title varchar(255) default NULL,
- prio int(10) unsigned default NULL,
- category int(10) unsigned default NULL,
- program int(10) unsigned default NULL,
- bugdesc text,
- created datetime default NULL,
- modified timestamp(14) NOT NULL,
- bugstatus int(10) unsigned default NULL,
- submitter int(10) unsigned default NULL
- ) ENGINE=MyISAM;
- INSERT INTO t1 VALUES (1,'Link',1,1,1,'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa','2001-02-28 08:40:16',20010228084016,0,4);
- SELECT CONCAT('"',CONCAT_WS('";"',title,prio,category,program,bugdesc,created,modified+0,bugstatus,submitter), '"') FROM t1;
- CONCAT('"',CONCAT_WS('";"',title,prio,category,program,bugdesc,created,modified+0,bugstatus,submitter), '"')
- "Link";"1";"1";"1";"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";"2001-02-28 08:40:16";"20010228084016";"0";"4"
- SELECT CONCAT('"',CONCAT_WS('";"',title,prio,category,program,bugstatus,submitter), '"') FROM t1;
- CONCAT('"',CONCAT_WS('";"',title,prio,category,program,bugstatus,submitter), '"')
- "Link";"1";"1";"1";"0";"4"
- SELECT CONCAT_WS('";"',title,prio,category,program,bugdesc,created,modified+0,bugstatus,submitter) FROM t1;
- CONCAT_WS('";"',title,prio,category,program,bugdesc,created,modified+0,bugstatus,submitter)
- Link";"1";"1";"1";"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";"2001-02-28 08:40:16";"20010228084016";"0";"4
- SELECT bugdesc, REPLACE(bugdesc, 'xxxxxxxxxxxxxxxxxxxx', 'bbbbbbbbbbbbbbbbbbbb') from t1 group by bugdesc;
- bugdesc REPLACE(bugdesc, 'xxxxxxxxxxxxxxxxxxxx', 'bbbbbbbbbbbbbbbbbbbb')
- aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
- drop table t1;
- CREATE TABLE t1 (id int(11) NOT NULL auto_increment, tmp text NOT NULL, KEY id (id)) ENGINE=MyISAM;
- INSERT INTO t1 VALUES (1, 'a545f661efdd1fb66fdee3aab79945bf');
- SELECT 1 FROM t1 WHERE tmp=AES_DECRYPT(tmp,"password");
- 1
- DROP TABLE t1;
- CREATE TABLE t1 (
- wid int(10) unsigned NOT NULL auto_increment,
- data_podp date default NULL,
- status_wnio enum('nowy','podp','real','arch') NOT NULL default 'nowy',
- PRIMARY KEY(wid)
- );
- INSERT INTO t1 VALUES (8,NULL,'real');
- INSERT INTO t1 VALUES (9,NULL,'nowy');
- SELECT elt(status_wnio,data_podp) FROM t1 GROUP BY wid;
- elt(status_wnio,data_podp)
- NULL
- NULL
- DROP TABLE t1;
- CREATE TABLE t1 (title text) ENGINE=MyISAM;
- INSERT INTO t1 VALUES ('Congress reconvenes in September to debate welfare and adult education');
- INSERT INTO t1 VALUES ('House passes the CAREERS bill');
- SELECT CONCAT("</a>",RPAD("",(55 - LENGTH(title)),".")) from t1;
- CONCAT("</a>",RPAD("",(55 - LENGTH(title)),"."))
- NULL
- </a>..........................
- DROP TABLE t1;
- CREATE TABLE t1 (i int, j int);
- INSERT INTO t1 VALUES (1,1),(2,2);
- SELECT DISTINCT i, ELT(j, '345', '34') FROM t1;
- i ELT(j, '345', '34')
- 1 345
- 2 34
- DROP TABLE t1;
- create table t1(a char(4));
- insert into t1 values ('one'),(NULL),('two'),('four');
- select a, quote(a), isnull(quote(a)), quote(a) is null, ifnull(quote(a), 'n') from t1;
- a quote(a) isnull(quote(a)) quote(a) is null ifnull(quote(a), 'n')
- one 'one' 0 0 'one'
- NULL NULL 0 0 NULL
- two 'two' 0 0 'two'
- four 'four' 0 0 'four'
- drop table t1;
- select trim(trailing 'foo' from 'foo');
- trim(trailing 'foo' from 'foo')
- select trim(leading 'foo' from 'foo');
- trim(leading 'foo' from 'foo')
- select quote(ltrim(concat(' ', 'a')));
- quote(ltrim(concat(' ', 'a')))
- 'a'
- select quote(trim(concat(' ', 'a')));
- quote(trim(concat(' ', 'a')))
- 'a'
- CREATE TABLE t1 SELECT 1 UNION SELECT 2 UNION SELECT 3;
- SELECT QUOTE('A') FROM t1;
- QUOTE('A')
- 'A'
- 'A'
- 'A'
- DROP TABLE t1;
- select 1=_latin1'1';
- 1=_latin1'1'
- 1
- select _latin1'1'=1;
- _latin1'1'=1
- 1
- select _latin2'1'=1;
- _latin2'1'=1
- 1
- select 1=_latin2'1';
- 1=_latin2'1'
- 1
- select _latin1'1'=_latin2'1';
- ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation '='
- select row('a','b','c') = row('a','b','c');
- row('a','b','c') = row('a','b','c')
- 1
- select row('A','b','c') = row('a','b','c');
- row('A','b','c') = row('a','b','c')
- 1
- select row('A' COLLATE latin1_bin,'b','c') = row('a','b','c');
- row('A' COLLATE latin1_bin,'b','c') = row('a','b','c')
- 0
- select row('A','b','c') = row('a' COLLATE latin1_bin,'b','c');
- row('A','b','c') = row('a' COLLATE latin1_bin,'b','c')
- 0
- select row('A' COLLATE latin1_general_ci,'b','c') = row('a' COLLATE latin1_bin,'b','c');
- ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation '='
- select concat(_latin1'a',_latin2'a');
- ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'concat'
- select concat(_latin1'a',_latin2'a',_latin5'a');
- ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE), (latin5_turkish_ci,COERCIBLE) for operation 'concat'
- select concat(_latin1'a',_latin2'a',_latin5'a',_latin7'a');
- ERROR HY000: Illegal mix of collations for operation 'concat'
- select concat_ws(_latin1'a',_latin2'a');
- ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'concat_ws'
- select FIELD('b','A','B');
- FIELD('b','A','B')
- 2
- select FIELD('B','A','B');
- FIELD('B','A','B')
- 2
- select FIELD('b' COLLATE latin1_bin,'A','B');
- FIELD('b' COLLATE latin1_bin,'A','B')
- 0
- select FIELD('b','A' COLLATE latin1_bin,'B');
- FIELD('b','A' COLLATE latin1_bin,'B')
- 0
- select FIELD(_latin2'b','A','B');
- ERROR HY000: Illegal mix of collations (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation 'field'
- select FIELD('b',_latin2'A','B');
- ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation 'field'
- select FIELD('b',_latin2'A','B',1);
- FIELD('b',_latin2'A','B',1)
- 1
- select POSITION(_latin1'B' IN _latin1'abcd');
- POSITION(_latin1'B' IN _latin1'abcd')
- 2
- select POSITION(_latin1'B' IN _latin1'abcd' COLLATE latin1_bin);
- POSITION(_latin1'B' IN _latin1'abcd' COLLATE latin1_bin)
- 0
- select POSITION(_latin1'B' COLLATE latin1_bin IN _latin1'abcd');
- POSITION(_latin1'B' COLLATE latin1_bin IN _latin1'abcd')
- 0
- select POSITION(_latin1'B' COLLATE latin1_general_ci IN _latin1'abcd' COLLATE latin1_bin);
- ERROR HY000: Illegal mix of collations (latin1_bin,EXPLICIT) and (latin1_general_ci,EXPLICIT) for operation 'locate'
- select POSITION(_latin1'B' IN _latin2'abcd');
- ERROR HY000: Illegal mix of collations (latin2_general_ci,COERCIBLE) and (latin1_swedish_ci,COERCIBLE) for operation 'locate'
- select FIND_IN_SET(_latin1'B',_latin1'a,b,c,d');
- FIND_IN_SET(_latin1'B',_latin1'a,b,c,d')
- 2
- select FIND_IN_SET(_latin1'B' COLLATE latin1_general_ci,_latin1'a,b,c,d' COLLATE latin1_bin);
- ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation 'find_in_set'
- select FIND_IN_SET(_latin1'B',_latin2'a,b,c,d');
- ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'find_in_set'
- select SUBSTRING_INDEX(_latin1'abcdabcdabcd',_latin1'd',2);
- SUBSTRING_INDEX(_latin1'abcdabcdabcd',_latin1'd',2)
- abcdabc
- select SUBSTRING_INDEX(_latin1'abcdabcdabcd',_latin2'd',2);
- ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'substr_index'
- select SUBSTRING_INDEX(_latin1'abcdabcdabcd' COLLATE latin1_general_ci,_latin1'd' COLLATE latin1_bin,2);
- ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation 'substr_index'
- select _latin1'B' between _latin1'a' and _latin1'c';
- _latin1'B' between _latin1'a' and _latin1'c'
- 1
- select _latin1'B' collate latin1_bin between _latin1'a' and _latin1'c';
- _latin1'B' collate latin1_bin between _latin1'a' and _latin1'c'
- 0
- select _latin1'B' between _latin1'a' collate latin1_bin and _latin1'c';
- _latin1'B' between _latin1'a' collate latin1_bin and _latin1'c'
- 0
- select _latin1'B' between _latin1'a' and _latin1'c' collate latin1_bin;
- _latin1'B' between _latin1'a' and _latin1'c' collate latin1_bin
- 0
- select _latin2'B' between _latin1'a' and _latin1'b';
- ERROR HY000: Illegal mix of collations (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation 'between'
- select _latin1'B' between _latin2'a' and _latin1'b';
- ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation 'between'
- select _latin1'B' between _latin1'a' and _latin2'b';
- ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE) for operation 'between'
- select _latin1'B' collate latin1_general_ci between _latin1'a' collate latin1_bin and _latin1'b';
- ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_bin,EXPLICIT), (latin1_swedish_ci,COERCIBLE) for operation 'between'
- select _latin1'B' in (_latin1'a',_latin1'b');
- _latin1'B' in (_latin1'a',_latin1'b')
- 1
- select _latin1'B' collate latin1_bin in (_latin1'a',_latin1'b');
- _latin1'B' collate latin1_bin in (_latin1'a',_latin1'b')
- 0
- select _latin1'B' in (_latin1'a' collate latin1_bin,_latin1'b');
- _latin1'B' in (_latin1'a' collate latin1_bin,_latin1'b')
- 0
- select _latin1'B' in (_latin1'a',_latin1'b' collate latin1_bin);
- _latin1'B' in (_latin1'a',_latin1'b' collate latin1_bin)
- 0
- select _latin2'B' in (_latin1'a',_latin1'b');
- ERROR HY000: Illegal mix of collations (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation ' IN '
- select _latin1'B' in (_latin2'a',_latin1'b');
- ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation ' IN '
- select _latin1'B' in (_latin1'a',_latin2'b');
- ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE) for operation ' IN '
- select _latin1'B' COLLATE latin1_general_ci in (_latin1'a' COLLATE latin1_bin,_latin1'b');
- ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_bin,EXPLICIT), (latin1_swedish_ci,COERCIBLE) for operation ' IN '
- select _latin1'B' COLLATE latin1_general_ci in (_latin1'a',_latin1'b' COLLATE latin1_bin);
- ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_swedish_ci,COERCIBLE), (latin1_bin,EXPLICIT) for operation ' IN '
- select collation(bin(130)), coercibility(bin(130));
- collation(bin(130)) coercibility(bin(130))
- latin1_swedish_ci 4
- select collation(oct(130)), coercibility(oct(130));
- collation(oct(130)) coercibility(oct(130))
- latin1_swedish_ci 4
- select collation(conv(130,16,10)), coercibility(conv(130,16,10));
- collation(conv(130,16,10)) coercibility(conv(130,16,10))
- latin1_swedish_ci 4
- select collation(hex(130)), coercibility(hex(130));
- collation(hex(130)) coercibility(hex(130))
- latin1_swedish_ci 4
- select collation(char(130)), coercibility(hex(130));
- collation(char(130)) coercibility(hex(130))
- latin1_swedish_ci 4
- select collation(format(130,10)), coercibility(format(130,10));
- collation(format(130,10)) coercibility(format(130,10))
- latin1_swedish_ci 4
- select collation(lcase(_latin2'a')), coercibility(lcase(_latin2'a'));
- collation(lcase(_latin2'a')) coercibility(lcase(_latin2'a'))
- latin2_general_ci 4
- select collation(ucase(_latin2'a')), coercibility(ucase(_latin2'a'));
- collation(ucase(_latin2'a')) coercibility(ucase(_latin2'a'))
- latin2_general_ci 4
- select collation(left(_latin2'a',1)), coercibility(left(_latin2'a',1));
- collation(left(_latin2'a',1)) coercibility(left(_latin2'a',1))
- latin2_general_ci 4
- select collation(right(_latin2'a',1)), coercibility(right(_latin2'a',1));
- collation(right(_latin2'a',1)) coercibility(right(_latin2'a',1))
- latin2_general_ci 4
- select collation(substring(_latin2'a',1,1)), coercibility(substring(_latin2'a',1,1));
- collation(substring(_latin2'a',1,1)) coercibility(substring(_latin2'a',1,1))
- latin2_general_ci 4
- select collation(concat(_latin2'a',_latin2'b')), coercibility(concat(_latin2'a',_latin2'b'));
- collation(concat(_latin2'a',_latin2'b')) coercibility(concat(_latin2'a',_latin2'b'))
- latin2_general_ci 4
- select collation(lpad(_latin2'a',4,_latin2'b')), coercibility(lpad(_latin2'a',4,_latin2'b'));
- collation(lpad(_latin2'a',4,_latin2'b')) coercibility(lpad(_latin2'a',4,_latin2'b'))
- latin2_general_ci 4
- select collation(rpad(_latin2'a',4,_latin2'b')), coercibility(rpad(_latin2'a',4,_latin2'b'));
- collation(rpad(_latin2'a',4,_latin2'b')) coercibility(rpad(_latin2'a',4,_latin2'b'))
- latin2_general_ci 4
- select collation(concat_ws(_latin2'a',_latin2'b')), coercibility(concat_ws(_latin2'a',_latin2'b'));
- collation(concat_ws(_latin2'a',_latin2'b')) coercibility(concat_ws(_latin2'a',_latin2'b'))
- latin2_general_ci 4
- select collation(make_set(255,_latin2'a',_latin2'b',_latin2'c')), coercibility(make_set(255,_latin2'a',_latin2'b',_latin2'c'));
- collation(make_set(255,_latin2'a',_latin2'b',_latin2'c')) coercibility(make_set(255,_latin2'a',_latin2'b',_latin2'c'))
- latin2_general_ci 4
- select collation(export_set(255,_latin2'y',_latin2'n',_latin2' ')), coercibility(export_set(255,_latin2'y',_latin2'n',_latin2' '));
- collation(export_set(255,_latin2'y',_latin2'n',_latin2' ')) coercibility(export_set(255,_latin2'y',_latin2'n',_latin2' '))
- latin2_general_ci 4
- select collation(trim(_latin2' a ')), coercibility(trim(_latin2' a '));
- collation(trim(_latin2' a ')) coercibility(trim(_latin2' a '))
- latin2_general_ci 4
- select collation(ltrim(_latin2' a ')), coercibility(ltrim(_latin2' a '));
- collation(ltrim(_latin2' a ')) coercibility(ltrim(_latin2' a '))
- latin2_general_ci 4
- select collation(rtrim(_latin2' a ')), coercibility(rtrim(_latin2' a '));
- collation(rtrim(_latin2' a ')) coercibility(rtrim(_latin2' a '))
- latin2_general_ci 4
- select collation(trim(LEADING _latin2' ' FROM _latin2'a')), coercibility(trim(LEADING _latin2'a' FROM _latin2'a'));
- collation(trim(LEADING _latin2' ' FROM _latin2'a')) coercibility(trim(LEADING _latin2'a' FROM _latin2'a'))
- latin2_general_ci 4
- select collation(trim(TRAILING _latin2' ' FROM _latin2'a')), coercibility(trim(TRAILING _latin2'a' FROM _latin2'a'));
- collation(trim(TRAILING _latin2' ' FROM _latin2'a')) coercibility(trim(TRAILING _latin2'a' FROM _latin2'a'))
- latin2_general_ci 4
- select collation(trim(BOTH _latin2' ' FROM _latin2'a')), coercibility(trim(BOTH _latin2'a' FROM _latin2'a'));
- collation(trim(BOTH _latin2' ' FROM _latin2'a')) coercibility(trim(BOTH _latin2'a' FROM _latin2'a'))
- latin2_general_ci 4
- select collation(repeat(_latin2'a',10)), coercibility(repeat(_latin2'a',10));
- collation(repeat(_latin2'a',10)) coercibility(repeat(_latin2'a',10))
- latin2_general_ci 4
- select collation(reverse(_latin2'ab')), coercibility(reverse(_latin2'ab'));
- collation(reverse(_latin2'ab')) coercibility(reverse(_latin2'ab'))
- latin2_general_ci 4
- select collation(quote(_latin2'ab')), coercibility(quote(_latin2'ab'));
- collation(quote(_latin2'ab')) coercibility(quote(_latin2'ab'))
- latin2_general_ci 4
- select collation(soundex(_latin2'ab')), coercibility(soundex(_latin2'ab'));
- collation(soundex(_latin2'ab')) coercibility(soundex(_latin2'ab'))
- latin2_general_ci 4
- select collation(substring(_latin2'ab',1)), coercibility(substring(_latin2'ab',1));
- collation(substring(_latin2'ab',1)) coercibility(substring(_latin2'ab',1))
- latin2_general_ci 4
- select collation(insert(_latin2'abcd',2,3,_latin2'ef')), coercibility(insert(_latin2'abcd',2,3,_latin2'ef'));
- collation(insert(_latin2'abcd',2,3,_latin2'ef')) coercibility(insert(_latin2'abcd',2,3,_latin2'ef'))
- latin2_general_ci 4
- select collation(replace(_latin2'abcd',_latin2'b',_latin2'B')), coercibility(replace(_latin2'abcd',_latin2'b',_latin2'B'));
- collation(replace(_latin2'abcd',_latin2'b',_latin2'B')) coercibility(replace(_latin2'abcd',_latin2'b',_latin2'B'))
- latin2_general_ci 4
- select collation(encode('abcd','ab')), coercibility(encode('abcd','ab'));
- collation(encode('abcd','ab')) coercibility(encode('abcd','ab'))
- binary 4
- create table t1
- select
- bin(130),
- oct(130),
- conv(130,16,10),
- hex(130),
- char(130),
- format(130,10),
- left(_latin2'a',1),
- right(_latin2'a',1),
- lcase(_latin2'a'),
- ucase(_latin2'a'),
- substring(_latin2'a',1,1),
- concat(_latin2'a',_latin2'b'),
- lpad(_latin2'a',4,_latin2'b'),
- rpad(_latin2'a',4,_latin2'b'),
- concat_ws(_latin2'a',_latin2'b'),
- make_set(255,_latin2'a',_latin2'b',_latin2'c'),
- export_set(255,_latin2'y',_latin2'n',_latin2' '),
- trim(_latin2' a '),
- ltrim(_latin2' a '),
- rtrim(_latin2' a '),
- trim(LEADING _latin2' ' FROM _latin2' a '),
- trim(TRAILING _latin2' ' FROM _latin2' a '),
- trim(BOTH _latin2' ' FROM _latin2' a '),
- repeat(_latin2'a',10),
- reverse(_latin2'ab'),
- quote(_latin2'ab'),
- soundex(_latin2'ab'),
- substring(_latin2'ab',1),
- insert(_latin2'abcd',2,3,_latin2'ef'),
- replace(_latin2'abcd',_latin2'b',_latin2'B'),
- encode('abcd','ab')
- ;
- Warnings:
- Warning 1265 Data truncated for column 'format(130,10)' at row 1
- show create table t1;
- Table Create Table
- t1 CREATE TABLE `t1` (
- `bin(130)` char(64) NOT NULL default '',
- `oct(130)` char(64) NOT NULL default '',
- `conv(130,16,10)` char(64) NOT NULL default '',
- `hex(130)` char(6) NOT NULL default '',
- `char(130)` char(1) NOT NULL default '',
- `format(130,10)` char(4) NOT NULL default '',
- `left(_latin2'a',1)` char(1) character set latin2 NOT NULL default '',
- `right(_latin2'a',1)` char(1) character set latin2 NOT NULL default '',
- `lcase(_latin2'a')` char(1) character set latin2 NOT NULL default '',
- `ucase(_latin2'a')` char(1) character set latin2 NOT NULL default '',
- `substring(_latin2'a',1,1)` char(1) character set latin2 NOT NULL default '',
- `concat(_latin2'a',_latin2'b')` char(2) character set latin2 NOT NULL default '',
- `lpad(_latin2'a',4,_latin2'b')` char(4) character set latin2 NOT NULL default '',
- `rpad(_latin2'a',4,_latin2'b')` char(4) character set latin2 NOT NULL default '',
- `concat_ws(_latin2'a',_latin2'b')` char(1) character set latin2 NOT NULL default '',
- `make_set(255,_latin2'a',_latin2'b',_latin2'c')` char(5) character set latin2 NOT NULL default '',
- `export_set(255,_latin2'y',_latin2'n',_latin2' ')` char(127) character set latin2 NOT NULL default '',
- `trim(_latin2' a ')` char(3) character set latin2 NOT NULL default '',
- `ltrim(_latin2' a ')` char(3) character set latin2 NOT NULL default '',
- `rtrim(_latin2' a ')` char(3) character set latin2 NOT NULL default '',
- `trim(LEADING _latin2' ' FROM _latin2' a ')` char(3) character set latin2 NOT NULL default '',
- `trim(TRAILING _latin2' ' FROM _latin2' a ')` char(3) character set latin2 NOT NULL default '',
- `trim(BOTH _latin2' ' FROM _latin2' a ')` char(3) character set latin2 NOT NULL default '',
- `repeat(_latin2'a',10)` char(10) character set latin2 NOT NULL default '',
- `reverse(_latin2'ab')` char(2) character set latin2 NOT NULL default '',
- `quote(_latin2'ab')` char(6) character set latin2 NOT NULL default '',
- `soundex(_latin2'ab')` char(4) character set latin2 NOT NULL default '',
- `substring(_latin2'ab',1)` char(2) character set latin2 NOT NULL default '',
- `insert(_latin2'abcd',2,3,_latin2'ef')` char(6) character set latin2 NOT NULL default '',
- `replace(_latin2'abcd',_latin2'b',_latin2'B')` char(4) character set latin2 NOT NULL default '',
- `encode('abcd','ab')` binary(4) NOT NULL default ''
- ) ENGINE=MyISAM DEFAULT CHARSET=latin1
- drop table t1;
- create table t1 (a char character set latin2);
- insert into t1 values (null);
- select charset(a), collation(a), coercibility(a) from t1;
- charset(a) collation(a) coercibility(a)
- latin2 latin2_general_ci 2
- drop table t1;
- select charset(null), collation(null), coercibility(null);
- charset(null) collation(null) coercibility(null)
- binary binary 5
- CREATE TABLE t1 (a int, b int);
- CREATE TABLE t2 (a int, b int);
- INSERT INTO t1 VALUES (1,1),(2,2);
- INSERT INTO t2 VALUES (2,2),(3,3);
- select t1.*,t2.* from t1 left join t2 on (t1.b=t2.b)
- where collation(t2.a) = _utf8'binary' order by t1.a,t2.a;
- a b a b
- 1 1 NULL NULL
- 2 2 2 2
- select t1.*,t2.* from t1 left join t2 on (t1.b=t2.b)
- where charset(t2.a) = _utf8'binary' order by t1.a,t2.a;
- a b a b
- 1 1 NULL NULL
- 2 2 2 2
- select t1.*,t2.* from t1 left join t2 on (t1.b=t2.b)
- where coercibility(t2.a) = 2 order by t1.a,t2.a;
- a b a b
- 1 1 NULL NULL
- 2 2 2 2
- DROP TABLE t1, t2;
- select SUBSTR('abcdefg',3,2);
- SUBSTR('abcdefg',3,2)
- cd
- select SUBSTRING('abcdefg',3,2);
- SUBSTRING('abcdefg',3,2)
- cd
- select SUBSTR('abcdefg',-3,2) FROM DUAL;
- SUBSTR('abcdefg',-3,2)
- ef
- select SUBSTR('abcdefg',-1,5) FROM DUAL;
- SUBSTR('abcdefg',-1,5)
- g
- select SUBSTR('abcdefg',0,0) FROM DUAL;
- SUBSTR('abcdefg',0,0)
- select SUBSTR('abcdefg',-1,-1) FROM DUAL;
- SUBSTR('abcdefg',-1,-1)
- select SUBSTR('abcdefg',1,-1) FROM DUAL;
- SUBSTR('abcdefg',1,-1)
- create table t7 (s1 char);
- select * from t7
- where concat(s1 collate latin1_general_ci,s1 collate latin1_swedish_ci) = 'AA';
- ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT) and (latin1_swedish_ci,EXPLICIT) for operation 'concat'
- drop table t7;
- select substring_index("1abcd;2abcd;3abcd;4abcd", ';', 2),substring_index("1abcd;2abcd;3abcd;4abcd", ';', -2);
- substring_index("1abcd;2abcd;3abcd;4abcd", ';', 2) substring_index("1abcd;2abcd;3abcd;4abcd", ';', -2)
- 1abcd;2abcd 3abcd;4abcd
- explain extended select md5('hello'), sha('abc'), sha1('abc'), soundex(''), 'mood' sounds like 'mud', aes_decrypt(aes_encrypt('abc','1'),'1'),concat('*',space(5),'*'), reverse('abc'), rpad('a',4,'1'), lpad('a',4,'1'), concat_ws(',','',NULL,'a'),make_set(255,_latin2'a',_latin2'b',_latin2'c'),elt(2,1),locate("a","b",2),format(130,10),char(0),conv(130,16,10),hex(130),binary 'HE', export_set(255,_latin2'y',_latin2'n',_latin2' '),FIELD('b' COLLATE latin1_bin,'A','B'),FIND_IN_SET(_latin1'B',_latin1'a,b,c,d'),collation(conv(130,16,10)), coercibility(conv(130,16,10)),length('ntrb _%\'),bit_length('ntrb _%\'),bit_length('ntrb _%\'),concat('monty',' was here ','again'),length('hello'),char(ascii('h')),ord('h'),quote(1/0),crc32("123"),replace('aaaa','a','b'),insert('txs',2,1,'hi'),left(_latin2'a',1),right(_latin2'a',1),lcase(_latin2'a'),ucase(_latin2'a'),SUBSTR('abcdefg',3,2),substring_index("1abcd;2abcd;3abcd;4abcd", ';', 2),trim(_latin2' a '),ltrim(_latin2' a '),rtrim(_latin2' a '), decode(encode(repeat("a",100000),"monty"),"monty");
- id select_type table type possible_keys key key_len ref rows Extra
- 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
- Warnings:
- Note 1003 select md5(_latin1'hello') AS `md5('hello')`,sha(_latin1'abc') AS `sha('abc')`,sha(_latin1'abc') AS `sha1('abc')`,soundex(_latin1'') AS `soundex('')`,(soundex(_latin1'mood') = soundex(_latin1'mud')) AS `'mood' sounds like 'mud'`,aes_decrypt(aes_encrypt(_latin1'abc',_latin1'1'),_latin1'1') AS `aes_decrypt(aes_encrypt('abc','1'),'1')`,concat(_latin1'*',repeat(_latin1' ',5),_latin1'*') AS `concat('*',space(5),'*')`,reverse(_latin1'abc') AS `reverse('abc')`,rpad(_latin1'a',4,_latin1'1') AS `rpad('a',4,'1')`,lpad(_latin1'a',4,_latin1'1') AS `lpad('a',4,'1')`,concat_ws(_latin1',',_latin1'',NULL,_latin1'a') AS `concat_ws(',','',NULL,'a')`,make_set(255,_latin2'a',_latin2'b',_latin2'c') AS `make_set(255,_latin2'a',_latin2'b',_latin2'c')`,elt(2,1) AS `elt(2,1)`,locate(_latin1'a',_latin1'b',2) AS `locate("a","b",2)`,format(130,10) AS `format(130,10)`,char(0) AS `char(0)`,conv(130,16,10) AS `conv(130,16,10)`,hex(130) AS `hex(130)`,cast(_latin1'HE' as char charset binary) AS `binary 'HE'`,export_set(255,_latin2'y',_latin2'n',_latin2' ') AS `export_set(255,_latin2'y',_latin2'n',_latin2' ')`,field((_latin1'b' collate _latin1'latin1_bin'),_latin1'A',_latin1'B') AS `FIELD('b' COLLATE latin1_bin,'A','B')`,find_in_set(_latin1'B',_latin1'a,b,c,d') AS `FIND_IN_SET(_latin1'B',_latin1'a,b,c,d')`,collation(conv(130,16,10)) AS `collation(conv(130,16,10))`,coercibility(conv(130,16,10)) AS `coercibility(conv(130,16,10))`,length(_latin1'n r \_\%\') AS `length('ntrb _%\')`,bit_length(_latin1'n r \_\%\') AS `bit_length('ntrb _%\')`,bit_length(_latin1'n r \_\%\') AS `bit_length('ntrb _%\')`,concat(_latin1'monty',_latin1' was here ',_latin1'again') AS `concat('monty',' was here ','again')`,length(_latin1'hello') AS `length('hello')`,char(ascii(_latin1'h')) AS `char(ascii('h'))`,ord(_latin1'h') AS `ord('h')`,quote((1 / 0)) AS `quote(1/0)`,crc32(_latin1'123') AS `crc32("123")`,replace(_latin1'aaaa',_latin1'a',_latin1'b') AS `replace('aaaa','a','b')`,insert(_latin1'txs',2,1,_latin1'hi') AS `insert('txs',2,1,'hi')`,left(_latin2'a',1) AS `left(_latin2'a',1)`,right(_latin2'a',1) AS `right(_latin2'a',1)`,lcase(_latin2'a') AS `lcase(_latin2'a')`,ucase(_latin2'a') AS `ucase(_latin2'a')`,substr(_latin1'abcdefg',3,2) AS `SUBSTR('abcdefg',3,2)`,substr_index(_latin1'1abcd;2abcd;3abcd;4abcd',_latin1';',2) AS `substring_index("1abcd;2abcd;3abcd;4abcd", ';', 2)`,trim(_latin2' a ') AS `trim(_latin2' a ')`,ltrim(_latin2' a ') AS `ltrim(_latin2' a ')`,rtrim(_latin2' a ') AS `rtrim(_latin2' a ')`,decode(encode(repeat(_latin1'a',100000))) AS `decode(encode(repeat("a",100000),"monty"),"monty")`
- SELECT lpad(12345, 5, "#");
- lpad(12345, 5, "#")
- 12345
- SELECT conv(71, 10, 36), conv('1Z', 36, 10);
- conv(71, 10, 36) conv('1Z', 36, 10)
- 1Z 71
- create table t1 (id int(1), str varchar(10)) DEFAULT CHARSET=utf8;
- insert into t1 values (1,'aaaaaaaaaa'), (2,'bbbbbbbbbb');
- create table t2 (id int(1), str varchar(10)) DEFAULT CHARSET=utf8;
- insert into t2 values (1,'cccccccccc'), (2,'dddddddddd');
- select substring(concat(t1.str, t2.str), 1, 15) "name" from t1, t2
- where t2.id=t1.id order by name;
- name
- aaaaaaaaaaccccc
- bbbbbbbbbbddddd
- drop table t1, t2;
- create table t1 (c1 INT, c2 INT UNSIGNED);
- insert into t1 values ('21474836461','21474836461');
- Warnings:
- Warning 1265 Data truncated for column 'c1' at row 1
- Warning 1265 Data truncated for column 'c2' at row 1
- insert into t1 values ('-21474836461','-21474836461');
- Warnings:
- Warning 1265 Data truncated for column 'c1' at row 1
- Warning 1265 Data truncated for column 'c2' at row 1
- show warnings;
- Level Code Message
- Warning 1265 Data truncated for column 'c1' at row 1
- Warning 1265 Data truncated for column 'c2' at row 1
- select * from t1;
- c1 c2
- 2147483647 4294967295
- -2147483648 0
- drop table t1;
- select left(1234, 3) + 0;
- left(1234, 3) + 0
- 123
- create table t1 (a int not null primary key, b varchar(40), c datetime);
- insert into t1 (a,b,c) values (1,'Tom','2004-12-10 12:13:14'),(2,'ball games','2004-12-10 12:13:14'), (3,'Basil','2004-12-10 12:13:14'), (4,'Dean','2004-12-10 12:13:14'),(5,'Ellis','2004-12-10 12:13:14'), (6,'Serg','2004-12-10 12:13:14'), (7,'Sergei','2004-12-10 12:13:14'),(8,'Georg','2004-12-10 12:13:14'),(9,'Salle','2004-12-10 12:13:14'),(10,'Sinisa','2004-12-10 12:13:14');
- select count(*) as total, left(c,10) as reg from t1 group by reg order by reg desc limit 0,12;
- total reg
- 10 2004-12-10
- drop table t1;
- select trim(null from 'kate') as "must_be_null";
- must_be_null
- NULL
- select trim('xyz' from null) as "must_be_null";
- must_be_null
- NULL
- CREATE TABLE t1 (
- id int(11) NOT NULL auto_increment,
- a bigint(20) unsigned default NULL,
- PRIMARY KEY (id)
- ) ENGINE=MyISAM;
- INSERT INTO t1 VALUES
- ('0','16307858876001849059');
- SELECT CONV('e251273eb74a8ee3', 16, 10);
- CONV('e251273eb74a8ee3', 16, 10)
- 16307858876001849059
- EXPLAIN
- SELECT id
- FROM t1
- WHERE a = 16307858876001849059;
- id select_type table type possible_keys key key_len ref rows Extra
- 1 SIMPLE t1 system NULL NULL NULL NULL 1
- EXPLAIN
- SELECT id
- FROM t1
- WHERE a = CONV('e251273eb74a8ee3', 16, 10);
- id select_type table type possible_keys key key_len ref rows Extra
- 1 SIMPLE t1 system NULL NULL NULL NULL 1
- DROP TABLE t1;
- SELECT CHAR(NULL,121,83,81,'76') as my_column;
- my_column
- ySQL
- SELECT CHAR_LENGTH(CHAR(NULL,121,83,81,'76')) as my_column;
- my_column
- 4
- CREATE TABLE t1 (id int PRIMARY KEY, str char(255) NOT NULL);
- CREATE TABLE t2 (id int NOT NULL UNIQUE);
- INSERT INTO t2 VALUES (1),(2);
- INSERT INTO t1 VALUES (1, aes_encrypt('foo', 'bar'));
- INSERT INTO t1 VALUES (2, 'not valid');
- SELECT t1.id, aes_decrypt(str, 'bar') FROM t1, t2 WHERE t1.id = t2.id;
- id aes_decrypt(str, 'bar')
- 1 foo
- 2 NULL
- SELECT t1.id, aes_decrypt(str, 'bar') FROM t1, t2 WHERE t1.id = t2.id
- ORDER BY t1.id;
- id aes_decrypt(str, 'bar')
- 1 foo
- 2 NULL
- DROP TABLE t1, t2;
- select field(0,NULL,1,0), field("",NULL,"bar",""), field(0.0,NULL,1.0,0.0);
- field(0,NULL,1,0) field("",NULL,"bar","") field(0.0,NULL,1.0,0.0)
- 3 3 3
- select field(NULL,1,2,NULL), field(NULL,1,2,0);
- field(NULL,1,2,NULL) field(NULL,1,2,0)
- 0 0
- CREATE TABLE t1 (str varchar(20) PRIMARY KEY);
- CREATE TABLE t2 (num int primary key);
- INSERT INTO t1 VALUES ('notnumber');
- INSERT INTO t2 VALUES (0), (1);
- SELECT * FROM t1, t2 WHERE num=str;
- str num
- notnumber 0
- SELECT * FROM t1, t2 WHERE num=substring(str from 1 for 6);
- str num
- notnumber 0
- DROP TABLE t1,t2;
- CREATE TABLE t1(
- id int(11) NOT NULL auto_increment,
- pc int(11) NOT NULL default '0',
- title varchar(20) default NULL,
- PRIMARY KEY (id)
- );
- INSERT INTO t1 VALUES
- (1, 0, 'Main'),
- (2, 1, 'Toys'),
- (3, 1, 'Games');
- SELECT t1.id, CONCAT_WS('->', t3.title, t2.title, t1.title) as col1
- FROM t1 LEFT JOIN t1 AS t2 ON t1.pc=t2.id
- LEFT JOIN t1 AS t3 ON t2.pc=t3.id;
- id col1
- 1 Main
- 2 Main->Toys
- 3 Main->Games
- SELECT t1.id, CONCAT_WS('->', t3.title, t2.title, t1.title) as col1
- FROM t1 LEFT JOIN t1 AS t2 ON t1.pc=t2.id
- LEFT JOIN t1 AS t3 ON t2.pc=t3.id
- WHERE CONCAT_WS('->', t3.title, t2.title, t1.title) LIKE '%Toys%';
- id col1
- 2 Main->Toys
- DROP TABLE t1;
- CREATE TABLE t1(
- trackid int(10) unsigned NOT NULL auto_increment,
- trackname varchar(100) NOT NULL default '',
- PRIMARY KEY (trackid)
- );
- CREATE TABLE t2(
- artistid int(10) unsigned NOT NULL auto_increment,
- artistname varchar(100) NOT NULL default '',
- PRIMARY KEY (artistid)
- );
- CREATE TABLE t3(
- trackid int(10) unsigned NOT NULL,
- artistid int(10) unsigned NOT NULL,
- PRIMARY KEY (trackid,artistid)
- );
- INSERT INTO t1 VALUES (1, 'April In Paris'), (2, 'Autumn In New York');
- INSERT INTO t2 VALUES (1, 'Vernon Duke');
- INSERT INTO t3 VALUES (1,1);
- SELECT CONCAT_WS(' ', trackname, artistname) trackname, artistname
- FROM t1 LEFT JOIN t3 ON t1.trackid=t3.trackid
- LEFT JOIN t2 ON t2.artistid=t3.artistid
- WHERE CONCAT_WS(' ', trackname, artistname) LIKE '%In%';
- trackname artistname
- April In Paris Vernon Duke Vernon Duke
- Autumn In New York NULL
- DROP TABLE t1,t2,t3;
- create table t1 (b varchar(5));
- insert t1 values ('ab'), ('abc'), ('abcd'), ('abcde');
- select *,substring(b,1),substring(b,-1),substring(b,-2),substring(b,-3),substring(b,-4),substring(b,-5) from t1;
- b substring(b,1) substring(b,-1) substring(b,-2) substring(b,-3) substring(b,-4) substring(b,-5)
- ab ab b ab
- abc abc c bc abc
- abcd abcd d cd bcd abcd
- abcde abcde e de cde bcde abcde
- select * from (select *,substring(b,1),substring(b,-1),substring(b,-2),substring(b,-3),substring(b,-4),substring(b,-5) from t1) t;
- b substring(b,1) substring(b,-1) substring(b,-2) substring(b,-3) substring(b,-4) substring(b,-5)
- ab ab b ab
- abc abc c bc abc
- abcd abcd d cd bcd abcd
- abcde abcde e de cde bcde abcde
- drop table t1;
- select hex(29223372036854775809), hex(-29223372036854775809);
- hex(29223372036854775809) hex(-29223372036854775809)
- FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF
- create table t1 (i int);
- insert into t1 values (1000000000),(1);
- select lpad(i, 7, ' ') as t from t1;
- Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
- def t 253 7 7 Y 128 31 63
- t
- 1000000
- 1
- select rpad(i, 7, ' ') as t from t1;
- Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
- def t 253 7 7 Y 128 31 63
- t
- 1000000
- 1
- drop table t1;