blob: d515b3ce34edfa75519edcce9603ace1386bd5f5 (
plain)
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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
--
-- CHAR
--
-- fixed-length by value
-- internally passed by value if <= 4 bytes in storage
SELECT char 'c' = char 'c' AS true;
true
------
t
(1 row)
--
-- Build a table for testing
--
CREATE TABLE CHAR_TBL(f1 char);
INSERT INTO CHAR_TBL (f1) VALUES ('a');
INSERT INTO CHAR_TBL (f1) VALUES ('A');
-- any of the following three input formats are acceptable
INSERT INTO CHAR_TBL (f1) VALUES ('1');
INSERT INTO CHAR_TBL (f1) VALUES (2);
INSERT INTO CHAR_TBL (f1) VALUES ('3');
-- zero-length char
INSERT INTO CHAR_TBL (f1) VALUES ('');
-- try char's of greater than 1 length
INSERT INTO CHAR_TBL (f1) VALUES ('cd');
ERROR: value too long for type character(1)
INSERT INTO CHAR_TBL (f1) VALUES ('c ');
SELECT * FROM CHAR_TBL;
f1
----
a
A
1
2
3
c
(7 rows)
SELECT c.*
FROM CHAR_TBL c
WHERE c.f1 <> 'a';
f1
----
A
1
2
3
c
(6 rows)
SELECT c.*
FROM CHAR_TBL c
WHERE c.f1 = 'a';
f1
----
a
(1 row)
SELECT c.*
FROM CHAR_TBL c
WHERE c.f1 < 'a';
f1
----
A
1
2
3
(5 rows)
SELECT c.*
FROM CHAR_TBL c
WHERE c.f1 <= 'a';
f1
----
a
A
1
2
3
(6 rows)
SELECT c.*
FROM CHAR_TBL c
WHERE c.f1 > 'a';
f1
----
c
(1 row)
SELECT c.*
FROM CHAR_TBL c
WHERE c.f1 >= 'a';
f1
----
a
c
(2 rows)
DROP TABLE CHAR_TBL;
--
-- Now test longer arrays of char
--
CREATE TABLE CHAR_TBL(f1 char(4));
INSERT INTO CHAR_TBL (f1) VALUES ('a');
INSERT INTO CHAR_TBL (f1) VALUES ('ab');
INSERT INTO CHAR_TBL (f1) VALUES ('abcd');
INSERT INTO CHAR_TBL (f1) VALUES ('abcde');
ERROR: value too long for type character(4)
INSERT INTO CHAR_TBL (f1) VALUES ('abcd ');
SELECT * FROM CHAR_TBL;
f1
------
a
ab
abcd
abcd
(4 rows)
|
