metadata.result
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:4k
- drop table if exists t1,t2;
- select 1, 1.0, -1, "hello", NULL;
- Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
- def 1 8 1 1 N 32897 0 63
- def 1.0 5 3 3 N 32897 1 63
- def -1 8 2 2 N 32897 0 63
- def hello 254 5 5 N 1 31 8
- def NULL 6 0 0 Y 32896 0 63
- 1 1.0 -1 hello NULL
- 1 1.0 -1 hello NULL
- create table t1 (a tinyint, b smallint, c mediumint, d int, e bigint, f float(3,2), g double(4,3), h decimal(5,4), i year, j date, k timestamp, l datetime, m enum('a','b'), n set('a','b'), o char(10));
- select * from t1;
- Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
- def test t1 t1 a a 1 4 0 Y 32768 0 63
- def test t1 t1 b b 2 6 0 Y 32768 0 63
- def test t1 t1 c c 9 9 0 Y 32768 0 63
- def test t1 t1 d d 3 11 0 Y 32768 0 63
- def test t1 t1 e e 8 20 0 Y 32768 0 63
- def test t1 t1 f f 4 3 0 Y 32768 2 63
- def test t1 t1 g g 5 4 0 Y 32768 3 63
- def test t1 t1 h h 0 7 0 Y 32768 4 63
- def test t1 t1 i i 13 4 0 Y 32864 0 63
- def test t1 t1 j j 10 10 0 Y 128 0 63
- def test t1 t1 k k 7 19 0 N 1249 0 63
- def test t1 t1 l l 12 19 0 Y 128 0 63
- def test t1 t1 m m 254 1 0 Y 256 0 8
- def test t1 t1 n n 254 3 0 Y 2048 0 8
- def test t1 t1 o o 254 10 0 Y 0 0 8
- a b c d e f g h i j k l m n o
- select a b, b c from t1 as t2;
- Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
- def test t1 t2 a b 1 4 0 Y 32768 0 63
- def test t1 t2 b c 2 6 0 Y 32768 0 63
- b c
- drop table t1;
- CREATE TABLE t1 (id tinyint(3) default NULL, data varchar(255) default NULL);
- INSERT INTO t1 VALUES (1,'male'),(2,'female');
- CREATE TABLE t2 (id tinyint(3) unsigned default NULL, data char(3) default '0');
- INSERT INTO t2 VALUES (1,'yes'),(2,'no');
- select t1.id, t1.data, t2.data from t1, t2 where t1.id = t2.id;
- Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
- def test t1 t1 id id 1 3 1 Y 32768 0 63
- def test t1 t1 data data 253 255 6 Y 0 0 8
- def test t2 t2 data data 254 3 3 Y 0 0 8
- id data data
- 1 male yes
- 2 female no
- select t1.id, t1.data, t2.data from t1, t2 where t1.id = t2.id order by t1.id;
- Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
- def test t1 t1 id id 1 3 1 Y 32768 0 63
- def test t1 t1 data data 253 255 6 Y 0 0 8
- def test t2 t2 data data 254 3 3 Y 0 0 8
- id data data
- 1 male yes
- 2 female no
- select t1.id from t1 union select t2.id from t2;
- Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
- def id id 1 4 1 Y 32768 0 63
- id
- 1
- 2
- drop table t1,t2;
- create table t1 ( a int, b varchar(30), primary key(a));
- insert into t1 values (1,'one');
- insert into t1 values (2,'two');
- set @arg00=1 ;
- select @arg00 FROM t1 where a=1 union distinct select 1 FROM t1 where a=1;
- Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
- def @arg00 @arg00 8 20 1 Y 32768 0 63
- @arg00
- 1
- select * from (select @arg00) aaa;
- Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
- def aaa @arg00 @arg00 8 20 1 Y 32768 0 63
- @arg00
- 1
- select 1 union select 1;
- Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
- def 1 1 8 20 1 N 32769 0 63
- 1
- 1
- select * from (select 1 union select 1) aaa;
- Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
- def aaa 1 1 8 20 1 N 32769 0 63
- 1
- 1
- drop table t1;
- create table t1 (i int);
- insert into t1 values (1),(2),(3);
- select * from t1 where i = 2;
- drop table t1;//
- affected rows: 0
- affected rows: 3
- info: Records: 3 Duplicates: 0 Warnings: 0
- i
- 2
- affected rows: 1
- affected rows: 0