CHAR(N,... [USING charset_name])
CHAR()解释每个参数n为一个整数，并返回包含这些整数的代码值中给出的字符的字符串。NULL值被跳过。
SQL> SELECT CHAR(77,121,83,81,'76'); +---------------------------------------------------------+ | CHAR(77,121,83,81,'76') | +---------------------------------------------------------+ | SQL | +---------------------------------------------------------+ 1 row in set (0.00 sec)
