数据库系统

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arrays.out：源码内容

							QUERY: SELECT * FROM arrtest;
a          |b              |c            |d                |e            |f                |g              
-----------+---------------+-------------+-----------------+-------------+-----------------+---------------
{1,2,3,4,5}|{{{0,0},{1,2}}}|{}           |{}               |             |{}               |{}             
{11,12,23} |{{3,4},{4,5}}  |{"foobar"}   |{{"elt1","elt2"}}|{"3.4","6.7"}|{"abc  ","abcde"}|{"abc","abcde"}
{}         |{3,4}          |{"foo","bar"}|{"bar","foo"}    |             |                 |               
(3 rows)
QUERY: SELECT arrtest.a[1],
          arrtest.b[1][1][1],
          arrtest.c[1],
          arrtest.d[1][1],
          arrtest.e[0]
   FROM arrtest;
 a|b|c     |d   |e
--+-+------+----+-
 1|0|      |    | 
11| |foobar|elt1| 
  | |foo   |    | 
(3 rows)
QUERY: SELECT arrtest.a[1:3],
          arrtest.b[1:1][1:2][1:2],
          arrtest.c[1:2],
          arrtest.d[1:1][1:2]
   FROM arrtest;
a         |b              |c            |d                
----------+---------------+-------------+-----------------
{1,2,3}   |{{{0,0},{1,2}}}|             |                 
{11,12,23}|               |             |{{"elt1","elt2"}}
          |               |{"foo","bar"}|                 
(3 rows)
QUERY: SELECT array_dims(arrtest.b) AS x;
x              
---------------
[1:1][1:2][1:2]
[1:2][1:2]     
[1:2]          
(3 rows)
QUERY: SELECT *
   FROM arrtest
   WHERE arrtest.a[1] < 5 and
         arrtest.c = '{"foobar"}'::_name;
a|b|c|d|e|f|g
-+-+-+-+-+-+-
(0 rows)
QUERY: SELECT arrtest.a[1:3],
          arrtest.b[1:1][1:2][1:2],
          arrtest.c[1:2],
          arrtest.d[1:1][1:2]
   FROM arrtest;
a         |b              |c            |d                
----------+---------------+-------------+-----------------
{1,2,3}   |{{{0,0},{1,2}}}|             |                 
{11,12,23}|               |             |{{"elt1","elt2"}}
          |               |{"foo","bar"}|                 
(3 rows)

						