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|
--
-- 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 '' AS seven, * FROM CHAR_TBL;
seven | f1
-------+----
| a
| A
| 1
| 2
| 3
|
| c
(7 rows)
SELECT '' AS six, c.*
FROM CHAR_TBL c
WHERE c.f1 <> 'a';
six | f1
-----+----
| A
| 1
| 2
| 3
|
| c
(6 rows)
SELECT '' AS one, c.*
FROM CHAR_TBL c
WHERE c.f1 = 'a';
one | f1
-----+----
| a
(1 row)
SELECT '' AS five, c.*
FROM CHAR_TBL c
WHERE c.f1 < 'a';
five | f1
------+----
| A
| 1
| 2
| 3
|
(5 rows)
SELECT '' AS six, c.*
FROM CHAR_TBL c
WHERE c.f1 <= 'a';
six | f1
-----+----
| a
| A
| 1
| 2
| 3
|
(6 rows)
SELECT '' AS one, c.*
FROM CHAR_TBL c
WHERE c.f1 > 'a';
one | f1
-----+----
| c
(1 row)
SELECT '' AS two, c.*
FROM CHAR_TBL c
WHERE c.f1 >= 'a';
two | 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 '' AS four, * FROM CHAR_TBL;
four | f1
------+------
| a
| ab
| abcd
| abcd
(4 rows)
|
