Set conditions in a MySQL stored procedure

To set conditions in a stored procedure, use IF...ELSE in MySQL. Following is the syntax for if-else −

IF yourCondition then
      yourStatement1,
 ELSE    
      yourStatement2,
 END IF;

Let us implement the above syntax in a stored procedure −

mysql> DELIMITER //
mysql> CREATE PROCEDURE IF_ELSE_DEMO(IN value int)
   -> BEGIN
   ->    SET @val=value;
   ->    IF @val > 10 then
   ->       select concat(@val,' is greater than 10');
   ->    ELSE
   ->        select concat(@val,' is less than 10 ');
   ->    END IF;
   -> END;
   -> //
Query OK, 0 rows affected (0.16 sec)

mysql> DELIMITER ;

Now you can call the stored procedure using CALL command −

mysql> call IF_ELSE_DEMO(18);

This will produce the following output −

+------------------------------------+
| concat(@val,' is greater than 10') |
+------------------------------------+
| 18 is greater than 10              |
+------------------------------------+
1 row in set (0.03 sec)
Query OK, 0 rows affected (0.04 sec)