varchar.sql

来自「PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统」· SQL 代码 · 共 32 行

-- 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);

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

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

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

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

CREATE INDEX vcharidx ON vchartmp USING GIST ( text(a) );

SET enable_seqscan=off;

SELECT count(*) FROM vchartmp WHERE a <   '31b0'::varchar(32);

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

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

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

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