The CASE control can also operate without an initial case value, evaluating a condition on each WHEN block.
mysql>mysql>mysql>mysql> DELIMITER //mysql> CREATE FUNCTION myFunction(delivery_day INT(1),preferred INT(1)) -> RETURNS INT(2) -> BEGIN -> -> DECLARE shipping_cost INT(2) DEFAULT 0; -> -> CASE -> WHEN preferred = 1 THEN -> SET shipping_cost = 2; -> WHEN delivery_day = 1 THEN -> SET shipping_cost = 20; -> WHEN delivery_day = 2 THEN -> SET shipping_cost = 15; -> WHEN delivery_day = 3 THEN -> SET shipping_cost = 10; -> ELSE -> SET shipping_cost = 5; -> END CASE; -> RETURN shipping_cost; -> -> END -> //Query OK, 0 rows affected (0.01 sec)mysql> DELIMITER ;mysql>mysql> select myFunction(1,1);+-----------------+| myFunction(1,1) |+-----------------+| 2 |+-----------------+1 row in set (0.00 sec)mysql>mysql> select myFunction(2,2);+-----------------+| myFunction(2,2) |+-----------------+| 15 |+-----------------+1 row in set (0.00 sec)mysql>mysql> select myFunction(3,3);+-----------------+| myFunction(3,3) |+-----------------+| 10 |+-----------------+1 row in set (0.00 sec)mysql>mysql> drop function myFunction;Query OK, 0 rows affected (0.00 sec)
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