Question

I need a procedure that verifies if a number is prime. The syntax appears to be fine, but a get the following error:

Query : CREATE PROCEDURE prime_number(IN n INT) BEGIN SET @prime = "Prime number"; SET @n_prime = "Not prime number"; SET @divider = …

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 ” at line 28

Here’s my code so far:

DELIMITER $
CREATE PROCEDURE prime_number(IN n INT)
BEGIN
    SET @prime = "Prime number";
    SET @n_prime = "Not prime number";
    SET @divider = 0;
    SET @i = 5;
    IF n % 2 = 0 THEN
        SELECT @n_prime;
        
    ELSEIF (n < 2) OR ((n % 3) = 0) THEN /* Was using ELSE IF, separatedly*/
        SELECT @n_prime;
        
    ELSE
        SET @root = SQRT(n);
        
        WHILE @i <= @root && @divider = 0 DO
            IF (n % @i) = 0 THEN
                SET @divider = 1;
            END IF;
            SET @i = @i + 1;
        END WHILE;
        
        IF @divider = 1 THEN SELECT @n_prime;
        ELSE SELECT @prime;
        END IF;
    
    END IF; /*Line 28*/
END $
DELIMITER ;

Any ideias why it’s happening?

Answer 1

Your problem is most likely ELSE IF. That creates another IF statement that requires another END IF. You want to use ELSEIF instead.