--
-- 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
-- (This temporarily hides the table created in test_setup.sql)
--
CREATE TEMP 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 
----
 1
 2
 3
  
(4 rows)

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
 c
(2 rows)

SELECT c.*
   FROM CHAR_TBL c
   WHERE c.f1 >= 'a';
 f1 
----
 a
 A
 c
(3 rows)

DROP TABLE CHAR_TBL;
--
-- Now test longer arrays of char
--
-- This char_tbl was already created and filled in test_setup.sql.
-- Here we just try to insert bad values.
--
INSERT INTO CHAR_TBL (f1) VALUES ('abcde');
ERROR:  value too long for type character(4)
SELECT * FROM CHAR_TBL;
  f1  
------
 a   
 ab  
 abcd
 abcd
(4 rows)