Update parent table column only if all the values of child table rows are a specific value

Question

I have 2 tables, orders and order_items. Each order can have multiple order_items.

An order has an id and orderStatus :

An order_item as id , orderId and orderItemStatus :

I want to update the status of order's from OPEN to FULFILLED if all an order's order_items have status of ISSUED . If at least one order_item is not ISSUED , the order status should remain as OPEN . How can I do this?

Answer 1

You can use a NOT EXISTS subquery as condition.

update order o
set o.orderStatus = 'FULFILLED'
where o.orderStatus = 'OPEN'
  and not exists (
    select *
    from order_item i
    where i.orderId = o.id
      and i.orderItemStatus <> 'ISSUED'
  )

This will only update orders which have status 'OPEN' and have no items with status 'ISSUED'.

Answer 2

You could check for orders_item with status ISSUED if this is the unique status

    update orders o
    inner join (
      select orderID, count( dictinct orderItemStatus)
      from order_item
      group by orderID
      having count( dictinct orderItemStatus) = 1
    )  t on t.orderID = o.id 
    inner join order_item i on i.orderID  = o.id 
      AND orderItemStatus  = 'ISSUED'