sql - got mysql error when during creating trigger

Question

hi iam new to mysql trigger .. this is my first trigger.. i m trying to run but got this error

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 'DECLARE x INT; SET x = new.product_price - old.product_price; INSERT into' at line 9

delimiter $$

CREATE TRIGGER product_update

BEFORE update ON w3xab_virtuemart_product_prices
FOR EACH ROW
BEGIN

IF (new.product_price <> old.product_price)
THEN 

    DECLARE x decimal(10,2) default 0;
    SET x = new.product_price - old.product_price;
    INSERT into product_price_log(virtuemart_product_id, old_product_price, new_product_price, product_price_update, price_update_date)
    VALUES (new.virtuemart_product_id, old.product_price, new.product_price, new.x, curtime());


END IF;
END$$

delimiter ;

Answer 1

DECLARE is permitted only inside a BEGIN ... END compound statement and must be at its start, before any other statements.

So move DECLARE after BEGIN.