Question

I want to select data from one of the tables in the database, on the basis of the parameter.
Here’s what I did.

DELIMITER $$

CREATE PROCEDURE `myDB`.`Temp`(
    IN ID INT(11)
)
    BEGIN
        SELECT CASE
            WHEN ID IN(1,2) THEN
                SELECT * FROM table1;
            WHEN ID IN(3,4) THEN
                SELECT * FROM table2;
        END CASE;
    END$$

DELIMITER ;

But. I’m getting error:

Error Code : 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax 
to use near 'SELECT * FROM table1;
        WHEN ID IN(3,4) THEN
            SELECT * FROM table2;
    END' at line 7

Answer 1

You can not use subquery inside case when you can use if else clauses.

IF(ID IN(1,2)) THEN
        SELECT * FROM table1;
ELSEIF(ID IN(3,4)) THEN
        SELECT * FROM table2;
END IF;