code green  1,726
Recognized Expert Top Contributor
I have a parent table `products` that contains all company products.
The product details are divided amongst 4-5 product details child tables
such as `paper`, `pens`, `books`, `sets`, `pens_paper`.
The 'product_ids` may be in one or more of these child tables but always in `products`.
Is a single DELETE query possible that will delete all occurences of a `product_id` in the tables where the `product_id` occurs.
3 9903  Motoma 3,237
Recognized Expert Specialist
I have a parent table `products` that contains all company products.
The product details are divided amongst 4-5 product details child tables
such as `paper`, `pens`, `books`, `sets`, `pens_paper`.
The 'product_ids` may be in one or more of these child tables but always in `products`.
Is a single DELETE query possible that will delete all occurences of a `product_id` in the tables where the `product_id` occurs.
One way to do this would be to use foreign keys between the tables and have cascading deletes in place.
code green 1,726
Recognized Expert Top Contributor
Thanks for the reply but I asked for a QUERY that performs a multiple delete based on the conditions.
code green 1,726
Recognized Expert Top Contributor
I seem to have solved it without any help.
Will post my solution - --delete id 100 wherever it appears across the database--
-
DELETE FROM `table1`,`table2`,`table3` USING `table1`
-
LEFT JOIN `table2` ON `table2`.`id` = 100 AND any_other_condition_for_table2
-
LEFT JOIN `table3` ON `table3`.`id` = 100 AND any_other_condition_for_table3
-
WHERE `table1`.`id` = 100
The left join solves the problem of the possibility of the id not appearing in a certain table
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