float4.out

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

-- float4 check
CREATE TABLE float4tmp (a float4);
\copy float4tmp from 'data/float4.data'
SET enable_seqscan=on;
SELECT count(*) FROM float4tmp WHERE a <  -179.0;
 count 
-------
   244
(1 row)

SELECT count(*) FROM float4tmp WHERE a <= -179.0;
 count 
-------
   245
(1 row)

SELECT count(*) FROM float4tmp WHERE a  = -179.0;
 count 
-------
     1
(1 row)

SELECT count(*) FROM float4tmp WHERE a >= -179.0;
 count 
-------
   303
(1 row)

SELECT count(*) FROM float4tmp WHERE a >  -179.0;
 count 
-------
   302
(1 row)

CREATE INDEX float4idx ON float4tmp USING gist ( a );
SET enable_seqscan=off;
SELECT count(*) FROM float4tmp WHERE a <  -179.0::float4;
 count 
-------
   244
(1 row)

SELECT count(*) FROM float4tmp WHERE a <= -179.0::float4;
 count 
-------
   245
(1 row)

SELECT count(*) FROM float4tmp WHERE a  = -179.0::float4;
 count 
-------
     1
(1 row)

SELECT count(*) FROM float4tmp WHERE a >= -179.0::float4;
 count 
-------
   303
(1 row)

SELECT count(*) FROM float4tmp WHERE a >  -179.0::float4;
 count 
-------
   302
(1 row)