MySQL: Returning multiple columns from an in-line subquery

Solution 1:

Move the inline SQL to be a inner join query. So you'd have something like...

SELECT  DATE_FORMAT(OrderDate,'%M %Y') AS OrderMonth, COUNT(OrderID) AS TotalOrders, SUM(OrderTotal) AS TotalAmount,  Z.OrderCustomerFK, Z.CustomerName, z.OrderTotal as CustomerTotal   
  FROM Orders     
  INNER JOIN (SELECT DATE_FORMAT(OrderDate,'%M %Y') as Mon, OrderCustomerFK, CustomerName, SUM(OrderTotal) as OrderTotal 
                FROM Orders 
               GROUP BY  DATE_FORMAT(OrderDate,'%M %Y'), OrderCustomerFK, CustomerName ORDER BY SUM(OrderTotal) DESC LIMIT 1) Z
          ON Z.Mon = DATE_FORMAT(OrderDate,'%M %Y')
    GROUP BY DATE_FORMAT(OrderDate,'%m%y'), Z.OrderCustomerFK, Z.CustomerName
    ORDER BY DATE_FORMAT(OrderDate,'%y%m') DESC

Solution 2:

You can also do something like:

SELECT 
    a.`y`,
    ( SELECT @c:=NULL ) AS `temp`,
    ( SELECT @d:=NULL ) AS `temp`,
    ( SELECT 
          CONCAT(@c:=b.`c`, @d:=b.`d`) 
      FROM `b`
      ORDER BY b.`uid` 
      LIMIT 1 ) AS `temp`,
    @c as c,
    @d as d
 FROM `a`

Solution 3:

Give this a shot:

  SELECT CONCAT(o.order_month, ' ', o.order_year),
         o.total_orders,
         o.total_amount,
         x.sum_order_total,
         x.ordercustomerfk,
         x.customername
    FROM (SELECT MONTH(t.orderdate) AS order_month,
                 YEAR(t.orderdate) AS order_year
                 COUNT(t.orderid) AS total_orders, 
                 SUM(t.ordertotal) AS total_amount
            FROM ORDERS t
        GROUP BY MONTH(t.orderdate), YEAR(t.orderdate)) o
    JOIN (SELECT MONTH(t.orderdate) AS ordermonth,
                 YEAR(t.orderdate) AS orderyear
                 SUM(t.ordertotal) 'sum_order_total',
                 t.ordercustomerfk,
                 c.customername
            FROM ORDERS t
            JOIN CUSTOMERS c ON c.customerid = o.ordercustomerfk
        GROUP BY t.ordercustomerfk, MONTH(t.orderdate), YEAR(t.orderdate)) x ON x.order_month = o.order_month
                                                                            AND x.order_year = o.order_year
ORDER BY o.order_year DESC, o.order_month DESC