IN MySQL 5 you could use a sub query( http://dev.mysql.com/doc/refman/5.0/en/any-in-some-subqueries.html).
However, i would try using a left join between cart and products and then bring back the results where the products.id field is 'NULL'. There may be a better way of doing this but that is what comes to mind first.
Ade Scott Haneda wrote:
4.0.18-standard-log I have a table cart and a table products Key is as follows: products.id = cart.prod_id The problem I have is we have decided to store the users cart, so when they come back it is still in the same state they left it. Pretty usual stuff so far. Two things can possible happen that would make this bad: 1) product has been deleted 2) product has been disabled. Just before I am checking the user out, I want to fix this scenario with a delete statement. What I need to do is: DELETE FROM cart where cart.prod_id does not exist in the products table, or where 'online' = 0. There is a user_id that I match on as well, but that does not entirely matter to this question. Deleting where online = 0 is simple, but deleting where there is a lack of a matching product has me stumped.
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