mysql - Rows won't delete when using left join -


i've got 2 tables on mysql server (5.5.25). 1 table holding product information other table keeps information on stock levels products. i've not defined foreign keys far:

mysql> describe product; +---------------------+--------------+------+-----+---------+----------------+ | field               | type         | null | key | default |          | +---------------------+--------------+------+-----+---------+----------------+ | id                  | int(11)      | no   | pri | null    | auto_increment | | product_no          | varchar(45)  | yes  |     | null    |                | | product_group       | int(11)      | no   |     | null    |                | +---------------------+--------------+------+-----+---------+----------------+  mysql> describe product_stock; +--------------+---------+------+-----+---------+----------------+ | field        | type    | null | key | default |          | +--------------+---------+------+-----+---------+----------------+ | id           | int(11) | no   | pri | null    | auto_increment | | product_id   | int(11) | no   |     | null    |                | | amnt_stocked | int(11) | no   |     | null    |                | +--------------+---------+------+-----+---------+----------------+

now job delete product_stock entries member of product_group 2. syntax is:

delete ps product_stock ps left join product p on ps.product_id = p.id  p.product_group = 2;

the problem is: mysql won't delete row. because of performance problems might occur don't want use subquery. found many examples of left joins combined delete statements , don't what's going wrong here....

delete product_stock product_stock inner join product  on product_stock.product_id = product.id product.product_group = 2;

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