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POMySQL: Returning multiple columns from an in-line subquery
 

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    <p>I'm creating an SQL statement that will return a month by month summary on sales.</p> <p>The summary will list some simple columns for the date, total number of sales and the total value of sales.</p> <p>However, in addition to these columns, i'd like to include 3 more that will list the months best customer by amount spent. For these columns, I need some kind of inline subquery that can return their ID, Name and the Amount they spent.</p> <p>My current effort uses an inline <code>SELECT</code> statement, however, from my knowledge on how to implement these, you can only return one column and row per in-line statement. </p> <p>To get around this with my scenario, I can of course create 3 separate in-line statements, however, besides this seeming impractical, it increases the query time more that necessary.</p> <pre><code>SELECT DATE_FORMAT(OrderDate,'%M %Y') AS OrderMonth, COUNT(OrderID) AS TotalOrders, SUM(OrderTotal) AS TotalAmount, (SELECT SUM(OrderTotal) FROM Orders WHERE DATE_FORMAT(OrderDate,'%M %Y') = OrderMonth GROUP BY OrderCustomerFK ORDER BY SUM(OrderTotal) DESC LIMIT 1) AS TotalCustomerAmount, (SELECT OrderCustomerFK FROM Orders WHERE DATE_FORMAT(OrderDate,'%M %Y') = OrderMonth GROUP BY OrderCustomerFK ORDER BY SUM(OrderTotal) DESC LIMIT 1) AS CustomerID, (SELECT CustomerName FROM Orders INNER JOIN Customers ON OrderCustomerFK = CustomerID WHERE DATE_FORMAT(OrderDate,'%M %Y') = OrderMonth GROUP BY OrderCustomerFK ORDER BY SUM(OrderTotal) DESC LIMIT 1) AS CustomerName FROM Orders GROUP BY DATE_FORMAT(OrderDate,'%m%y') ORDER BY DATE_FORMAT(OrderDate,'%y%m') DESC </code></pre> <p>How can i better structure this query?</p> <hr> <h2>FULL ANSWER</h2> <p>After some tweaking of Dave Barkers solution, I have a final version for anyone in the future looking for help.</p> <p>The solution by Dave Barker worked perfectly with the customer details, however, it made the simpler Total Sales and Total Sale Amount columns get some crazy figures.</p> <pre><code>SELECT Y.OrderMonth, Y.TotalOrders, Y.TotalAmount, Z.OrdCustFK, Z.CustCompany, Z.CustOrdTotal, Z.CustSalesTotal FROM (SELECT OrdDate, DATE_FORMAT(OrdDate,'%M %Y') AS OrderMonth, COUNT(OrderID) AS TotalOrders, SUM(OrdGrandTotal) AS TotalAmount FROM Orders WHERE OrdConfirmed = 1 GROUP BY DATE_FORMAT(OrdDate,'%m%y') ORDER BY DATE_FORMAT(OrdDate,'%Y%m') DESC) Y INNER JOIN (SELECT DATE_FORMAT(OrdDate,'%M %Y') AS CustMonth, OrdCustFK, CustCompany, COUNT(OrderID) AS CustOrdTotal, SUM(OrdGrandTotal) AS CustSalesTotal FROM Orders INNER JOIN CustomerDetails ON OrdCustFK = CustomerID WHERE OrdConfirmed = 1 GROUP BY DATE_FORMAT(OrdDate,'%m%y'), OrdCustFK ORDER BY SUM(OrdGrandTotal) DESC) Z ON Z.CustMonth = Y.OrderMonth GROUP BY DATE_FORMAT(OrdDate,'%Y%m') ORDER BY DATE_FORMAT(OrdDate,'%Y%m') DESC </code></pre>
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    1. COA final note on the full solution is that it reduced my original query time from approx 4 secs down to 0.08 secs
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