CHAR(N,... [USING charset_name])
CHAR() interprets each argument N as an integer.
NULL values are skipped.
By default, CHAR() returns a binary string.
mysql> mysql> SELECT CHAR(7,2,3,4,5); +-----------------+ | CHAR(7,2,3,4,5) | +-----------------+ | | +-----------------+ 1 row in set (0.00 sec)