mirror of
https://gitee.com/he3db/he3pg.git
synced 2024-12-06 06:07:34 +08:00
92 lines
1.5 KiB
Plaintext
92 lines
1.5 KiB
Plaintext
-- int4 check
|
|
CREATE TABLE int4tmp (a int4);
|
|
\copy int4tmp from 'data/int2.data'
|
|
SET enable_seqscan=on;
|
|
SELECT count(*) FROM int4tmp WHERE a < 237;
|
|
count
|
|
-------
|
|
297
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM int4tmp WHERE a <= 237;
|
|
count
|
|
-------
|
|
298
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM int4tmp WHERE a = 237;
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM int4tmp WHERE a >= 237;
|
|
count
|
|
-------
|
|
249
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM int4tmp WHERE a > 237;
|
|
count
|
|
-------
|
|
248
|
|
(1 row)
|
|
|
|
SELECT a, a <-> '237' FROM int4tmp ORDER BY a <-> '237' LIMIT 3;
|
|
a | ?column?
|
|
-----+----------
|
|
237 | 0
|
|
232 | 5
|
|
228 | 9
|
|
(3 rows)
|
|
|
|
CREATE INDEX int4idx ON int4tmp USING gist ( a );
|
|
SET enable_seqscan=off;
|
|
SELECT count(*) FROM int4tmp WHERE a < 237::int4;
|
|
count
|
|
-------
|
|
297
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM int4tmp WHERE a <= 237::int4;
|
|
count
|
|
-------
|
|
298
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM int4tmp WHERE a = 237::int4;
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM int4tmp WHERE a >= 237::int4;
|
|
count
|
|
-------
|
|
249
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM int4tmp WHERE a > 237::int4;
|
|
count
|
|
-------
|
|
248
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT a, a <-> '237' FROM int4tmp ORDER BY a <-> '237' LIMIT 3;
|
|
QUERY PLAN
|
|
------------------------------------------------
|
|
Limit
|
|
-> Index Only Scan using int4idx on int4tmp
|
|
Order By: (a <-> 237)
|
|
(3 rows)
|
|
|
|
SELECT a, a <-> '237' FROM int4tmp ORDER BY a <-> '237' LIMIT 3;
|
|
a | ?column?
|
|
-----+----------
|
|
237 | 0
|
|
232 | 5
|
|
228 | 9
|
|
(3 rows)
|
|
|