1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
-- 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)
|
