char.out

来自「PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统」· OUT 代码 · 共 67 行

-- char check
CREATE TABLE chartmp (a char(32));
\copy chartmp from 'data/char.data'
SET enable_seqscan=on;
SELECT count(*) FROM chartmp WHERE a <   '31b0'::char(32);
 count 
-------
   587
(1 row)

SELECT count(*) FROM chartmp WHERE a <=  '31b0'::char(32);
 count 
-------
   588
(1 row)

SELECT count(*) FROM chartmp WHERE a  =  '31b0'::char(32);
 count 
-------
     1
(1 row)

SELECT count(*) FROM chartmp WHERE a >=  '31b0'::char(32);
 count 
-------
   401
(1 row)

SELECT count(*) FROM chartmp WHERE a >   '31b0'::char(32);
 count 
-------
   400
(1 row)

CREATE INDEX charidx ON chartmp USING GIST ( a );
SET enable_seqscan=off;
SELECT count(*) FROM chartmp WHERE a <   '31b0'::char(32);
 count 
-------
   587
(1 row)

SELECT count(*) FROM chartmp WHERE a <=  '31b0'::char(32);
 count 
-------
   588
(1 row)

SELECT count(*) FROM chartmp WHERE a  =  '31b0'::char(32);
 count 
-------
     1
(1 row)

SELECT count(*) FROM chartmp WHERE a >=  '31b0'::char(32);
 count 
-------
   401
(1 row)

SELECT count(*) FROM chartmp WHERE a >   '31b0'::char(32);
 count 
-------
   400
(1 row)