SELECT all orders with more than one item and check all items status

Question

I have 2 tables:

Orders:

Id   |  Status
-----+--------
 1   |      OK
 2   | WAITING
 3   | WAITING
 4   |      OK
 5   |      OK
 6   |      OK
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Answer 1

select O.id
from orders O inner join order_details OD
on O.Id=OD.Order_Id and O.Status='OK' AND OD.Status IN ('S1','S2')
GROUP BY O.Id
HAVING count(DISTINCT OD.Id)>1