满足特定条件的 MySQL Select 行

Question

I have table orders that does look like this:

order_id | item_id | quantity
     1        1         2
     1        2         5
     2        3         13
     2        4         5
     3        3         1

I do want to SELECT all rows, but I'd like to skip entire orders that does contain exactly 13 items of item_id 3. In this example it should skip rows with order_id=2. Is it possible to do with one simple query?

Answer 1

You can use a NOT EXISTS clause to find any orders that don't have 13 items of item_id 3:

SELECT *
FROM orders o1
WHERE NOT EXISTS (SELECT * 
                  FROM orders o2
                  WHERE o2.order_id = o1.order_id
                    AND o2.item_id = 3 
                    AND o2.quantity = 13)

Output:

order_id    item_id     quantity
1           1           2
1           2           5
3           3           1

Demo on dbfiddle