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Editorial Team
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Asked: 2026-05-19T01:52:52+00:00

DELIMITER $$ CREATE TRIGGER stock_empty AFTER UPDATE on products FOR EACH ROW DELETE FROM

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    DELIMITER $$
CREATE TRIGGER stock_empty AFTER UPDATE on products
    FOR EACH ROW
    DELETE FROM products WHERE stock <=0;
    END$$

I am trying to make my products table check itself after every UPDATE statement and delete rows that have 0 or negative stock counts. I could manage to get this far, but it is not working.

Thanks for any help

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1 Answer

  1. Editorial Team

    If it’s that easy, how come you didn’t solve it yourself?

    DELIMITER ||
CREATE TRIGGER stock_empty AFTER UPDATE on products
FOR EACH ROW BEGIN
DELETE FROM products WHERE stock <=0;
END ||

    [edit]

    That’s how correct syntax should look like, however there’s one more thing:

    A stored function or trigger cannot
    modify a table that is already being
    used (for reading or writing) by the
    statement that invoked the function or
    trigger.

    From: http://dev.mysql.com/doc/refman/5.5/en/stored-program-restrictions.html

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