如何选择所有联接记录都不符合条件的记录

Question

I've a setup with the following tables (using MySQL):

• orders , which have many:
• a join table order_items , which have one from the:
• products table

I've written a query to select orders where all their products are of a certain type :

SELECT orders.* FROM orders 
INNER JOIN order_items ON order_items.order_id = orders.id   
INNER JOIN products ON products.id = order_items.product_id     
WHERE products.type = 'FooProduct'
AND (
  NOT EXISTS (
    SELECT null
    FROM products
    INNER JOIN order_items ON order_items.product_id = products.id
    WHERE order_items.order_id = orders.id
    AND products.type != 'FooProduct'
  )
 )

I run similar a couple of times: firstly to get orders comprised of all FooProduct s, and again to get orders with all BarProduct s.

My sticking point has been generating a third query to get all other orders, ie where all their products' types are not exclusively FooProduct s, or exclusively BarProduct s (aka a mix of the two, or other product types).

So, my question is how can I get all records where all product types aren't exclusively FooProduct s or exclusively BarProduct .

---

Here's a little example data, from which I'd like to return the orders with the IDs 3 and 4:

- orders
id
 1
 2
 3
 4

-- order_items

id order_id product_id
 1        1          1
 2        1          1
 3        2          2
 4        2          2
 5        3          3
 6        3          4
 7        4          1
 8        4          2

-- products
id type
 1 'FooProduct'
 2 'BarProduct'
 3 'OtherProduct'
 4 'YetAnotherProduct'

I've attempted this, awfully so placing as a subtext, with the following in place of the existing AND (even the syntax is way off):

NOT HAVING COUNT(order_items.*) = (
  SELECT null
        FROM products
        INNER JOIN order_items ON  order_items.product_id = products.id
        WHERE order_items.order_id = orders.id
        AND products.type IN ('FooProduct', 'BarProduct')
)

Answer 1

Instead of using Correlated subqueries, you can use Having and conditional aggregation function based filtering.

products.type IN ('FooProduct', 'BarProduct') will return 0 if a product type is none of them. We can use Sum() function on it, for further filtering.

Try the following instead:

SELECT orders.order_id 
FROM orders 
INNER JOIN order_items ON order_items.order_id = orders.id   
INNER JOIN products ON products.id = order_items.product_id 
GROUP BY orders.order_id 
HAVING SUM(products.type IN ('FooProduct', 'BarProduct')) < COUNT(*)

---

For the case, where you are looking for orders which has only FooProduct type, you can use the following instead:

SELECT orders.order_id 
FROM orders 
INNER JOIN order_items ON order_items.order_id = orders.id   
INNER JOIN products ON products.id = order_items.product_id 
GROUP BY orders.order_id 
HAVING SUM(products.type <> 'FooProduct') = 0

Another possible approach is:

SELECT orders.order_id 
FROM orders 
INNER JOIN order_items ON order_items.order_id = orders.id   
INNER JOIN products ON products.id = order_items.product_id 
GROUP BY orders.order_id 
HAVING SUM(products.type = 'FooProduct') = COUNT(*)

Answer 2

You can use aggregation and a having clause for this:

SELECT o.*
FROM orders o INNER JOIN
     order_items oi
     ON oi.order_id = o.id INNER JOIN
     products p
     ON p.id = oi.product_id   
GROUP BY o.id  -- OK assuming `id` is the primary key
HAVING SUM(p.type NOT IN ('FooProduct', 'BarProduct')) > 0;  -- at least one other product 

Actually, that is not quite right. This gets orders that have some other product, but it doesn't pick up orders that are mixes only of foo and bar. I think this gets the others:

HAVING SUM(p.type = 'FooProduct') < COUNT(*) AND
       SUM(p.type = 'BarProduct') < COUNT(*) 

Answer 3

This is a relational division problem.
One solution to find orders where all products are of a given type is this:

SELECT *
FROM orders
INNER JOIN order_items ON order_items.order_id = orders.id
INNER JOIN products ON products.id = order_items.product_id
WHERE orders.id IN (
    SELECT order_items.order_id
    FROM order_items
    INNER JOIN products ON products.id = order_items.product_id
    GROUP BY order_items.order_id
    HAVING COUNT(CASE WHEN products.type = 'FooProduct' THEN 1 END) = COUNT(*)
)

Tweak the above just a little to find orders where all products are from a list of given types is this:

HAVING COUNT(CASE WHEN products.type IN ('FooProduct', 'BarProduct') THEN 1 END) = COUNT(*)

And to find all orders where all products match all types from a given list is this:

HAVING COUNT(CASE WHEN products.type IN ('FooProduct', 'BarProduct') THEN 1 END) = COUNT(*)
AND    COUNT(DISTINCT products.type) = 2

DB Fiddle with tests

Answer 4

This is a basic solution, not so efficient but easy:

SELECT * FROM orders WHERE id NOT IN (
    SELECT orders.id FROM orders 
    INNER JOIN order_items ON order_items.order_id = orders.id   
    INNER JOIN products ON products.id = order_items.product_id     
    WHERE products.type = 'FooProduct'
    AND (
      NOT EXISTS (
        SELECT null
        FROM products
        INNER JOIN order_items ON order_items.product_id = products.id
        WHERE order_items.order_id = orders.id
        AND products.type != 'FooProduct'
      )
 )
) AND id NOT IN (
    SELECT orders.id FROM orders 
    INNER JOIN order_items ON order_items.order_id = orders.id   
    INNER JOIN products ON products.id = order_items.product_id     
    WHERE products.type = 'BarProduct'
    AND (
      NOT EXISTS (
        SELECT null
        FROM products
        INNER JOIN order_items ON order_items.product_id = products.id
        WHERE order_items.order_id = orders.id
        AND products.type != 'BarProduct'
      )
 )
)

Answer 5

I would suggest using count(distinct) in joined subselect like this:

SELECT orders.*
FROM orders 
inner join (
    SELECT orderid, max(products.type) as products_type
    FROM order_items
    INNER JOIN products ON products.id = order_items.product_id
    GROUP BY orderid
    -- distinct count of different products = 1 
    --    -> all order items are for the same product type
    HAVING COUNT(distinct products.type ) = 1 
    -- alternative is:
    -- min(products.type )=max(products.type )
) as tmp on tmp.orderid=orders.orderid 
WHERE 1=1
-- if you want only single type product orders for some specific product
and tmp.products_type = 'FooProduct'