varchar.out

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

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

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

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

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

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

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

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

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

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

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