I am struggling with creating a Stored Procedure in SQL Server for getting sales statistics. I have managed to get the information I need out, but the query is a mess and I have probably messed up the table variable by using 3 different ones.
Any ideas on how to merge this triple part-query into one?
BEGIN SET NOCOUNT ON; DECLARE @SalesStats TABLE ( NumberOfProcessed int, SellerID int ) DECLARE @1 TABLE( NumberOfPaidOrders int, SellerID int ) DECLARE @2 TABLE( TotalAmountPaid int, SellerID int ) --Number of Processed orders. Removing 0 as its test account. INSERT INTO @SalesStats (NumberOfProcessed, PO.SellerID) SELECT COUNT(PO.OrderId) AS NumberOfProcessed, PO.SellerID FROM ProcessedORder AS PO WHERE NOT PO.SellerID = 0 GROUP BY PO.SellerID ORDER BY PO.SellerID --Number of paid orders INSERT INTO @1 (NumberOfPaidOrders, SellerID) SELECT COUNT(AA.OrderId) AS NumberOfPaidOrders, AA.SellerID FROM AcceptedOrder AS AA LEFT JOIN ProcessedORder AS PO ON AA.OrderId = PO.OrderId GROUP BY AA.SellerID ORDER BY AA.SellerID --Total amount paid INSERT INTO @2 (TotalAmountPaid, SellerID) SELECT SUM(AA.Amount) AS TotalAmountPaid, SellerID FROM AcceptedOrder AS AA GROUP BY AA.SellerID ORDER BY AA.SellerID SELECT DISTINCT(SS.SellerID), SS.NumberOfProcessed, one.NumberOfPaidOrders, two.TotalAmountPaid, two.TotalAmountPaid / one.NumberOfPaidOrders AS AverageAmountPaid FROM @SalesStats AS SS LEFT JOIN @1 AS one ON SS.SellerID = one.SellerID LEFT JOIN @2 AS two ON SS.SellerID = two.SellerID ORDER BY SS.NumberOfProcessed DESC
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