bit.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

-- bit check

CREATE TABLE bittmp (a bit(33));

\copy bittmp from 'data/bit.data'

SET enable_seqscan=on;

SELECT count(*) FROM bittmp WHERE a <   '011011000100010111011000110000100';

SELECT count(*) FROM bittmp WHERE a <=  '011011000100010111011000110000100';

SELECT count(*) FROM bittmp WHERE a  =  '011011000100010111011000110000100';

SELECT count(*) FROM bittmp WHERE a >=  '011011000100010111011000110000100';

SELECT count(*) FROM bittmp WHERE a >   '011011000100010111011000110000100';

CREATE INDEX bitidx ON bittmp USING GIST ( a );

SET enable_seqscan=off;

SELECT count(*) FROM bittmp WHERE a <   '011011000100010111011000110000100';

SELECT count(*) FROM bittmp WHERE a <=  '011011000100010111011000110000100';

SELECT count(*) FROM bittmp WHERE a  =  '011011000100010111011000110000100';

SELECT count(*) FROM bittmp WHERE a >=  '011011000100010111011000110000100';

SELECT count(*) FROM bittmp WHERE a >   '011011000100010111011000110000100';