Hi,
In my db, I have a "sales" table and a "sales_item". Sometimes, something goes wrong and the sale is recorded but not the sales item's.
So I'm trying to get the salesID from my table "sales" that haven't got any rows in the sales_item table.

Here's the mysql query I thought would work, but it doesn't:

SELECT s.*
FROM sales s NATURAL JOIN sales_item si
WHERE s.date like '" . ((isset($_GET['date'])) ? $_GET['date'] : date("Y-m-d")) . "%'
AND v.sales_id like '" . ((isset($_GET['shop'])) ? $_GET['shop'] : substr($_COOKIE['shop'], 0, 3)) ."%'
HAVING count(si.sales_item_id) = 0;

Any thoughts?