Procedure Function MySQL Tutorial

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  3. Procedure Function
  4. A function that takes a parameter, performs an operation using an SQL function, and returns the result
In this case, it is unnecessary to use delimiter because the function definition contains no internal ; statement delimiters:

mysql>
mysql> CREATE FUNCTION hello (s CHAR(20)) RETURNS CHAR(50)
    ->     RETURN CONCAT('Hello, ',s,'!');
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> SELECT hello('world');
+----------------+
| hello('world') |
+----------------+
| Hello, world!  |
+----------------+
1 row in set (0.00 sec)
mysql>
mysql> drop function hello;
Query OK, 0 rows affected (0.00 sec)
mysql>