Question

To simplify, I have tree tables: products, products-vs-orders, orders

1. products fields : ‘ProductID’, ‘Name’, ‘isGratis’, …
2. products-vs-orders fields : ‘ProductID’, ‘OrderID’
3. orders fields : ‘OrderID’, ‘Title’, …

Actually, I have a query like this:

SELECT orders.OrderID, orders.Title, COUNT(`products`.`isGratis`) AS "Quantity", `products`.`isGratis`
FROM `orders`, `products-vs-orders`, `products`
WHERE `orders`.`OrderID` = `products-vs-orders`.`OrderID` AND `products-vs-orders`.`ProductID` = `products`.`ProductID`
GROUP BY `products`.`PackID`, `products`.`isGratis`

This query works and return this surch of result:

OrderID,    Title,      Quantity,   isGratis
1            My Order      20           0
1            My Order      3            1
2            An other      8            0
2            An other      1            1

How can I retrieve the count of products ‘gratis’ and ‘paid’ in to separate cols ?

OrderID,    Title,      Qt Paid,        Qt Gratis
1            My Order       20              3
2            An other       8               1

Answer 1

Try this:

SELECT
    orders.OrderID,
    orders.Title, 
    COUNT(orders.OrderId) - SUM(`products`.`isGratis`) AS "Qt Paid", 
    SUM(`products`.`isGratis`) AS "Qt Gratis" 
WHERE `orders`.`OrderID` = `products-vs-orders`.`OrderID`
  AND `products-vs-orders`.`ProductID` = `products`.`ProductID`
GROUP BY `products`.`PackID`