Question

I got a table for sales order and purchase order.

Sales order

Date   Amount

 26/10  120
 26/10  130 
 26/10  50
 27/10  50 
 27/10  60

Purchase Order

Date   Amount

 26/10  200 
 26/10  300 
 26/10  100
 27/10  100 
 27/10  100

I want to display the total sales and total purchase by date.

E.g.

 Date   Total Sales Total Purchases 
  26/10    300            600 
  27/10    110            200

My SQL query is like this but it doesnt work.

$query = "Select o.date, o.Amount AS Sales, p.date, p.Amount AS Purchases
          From customerorder o
          right join Purchaseorder p on o.date = p.date
          order by o.date";

Please help! Thanks!

Answer 1

    SELECT COALESCE(o.date, p.date) date, Sales, Purchases
      FROM (SELECT date, SUM(amount) Sales FROM CustomerOrder GROUP BY date) o
 FULL JOIN (SELECT date, SUM(amount) Purchases FROM PurchaseOrder GROUP BY date) p
        ON o.date = p.date
  ORDER BY date

MySQL doesn’t support FULL JOIN, so specifically for MySQL, you can use

    SELECT o.date, Sales, Purchases
      FROM (SELECT date, SUM(amount) Sales FROM CustomerOrder GROUP BY date) o
 LEFT JOIN (SELECT date, SUM(amount) Purchases FROM PurchaseOrder GROUP BY date) p
        ON o.date = p.date
 UNION ALL
    SELECT date, NULL, SUM(amount) Purchases
      FROM PurchaseOrder p2
     WHERE NOT EXISTS (SELECT *
                       FROM CustomerOrder o2
                       WHERE o2.date = p2.date)
  GROUP BY date
  ORDER BY date