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| 1 | +CREATE FUNCTION GetCustomerOrderReport(@startDate DATE, @endDate DATE) |
| 2 | +RETURNS TABLE |
| 3 | +AS |
| 4 | +RETURN ( |
| 5 | + WITH RankedOrders AS ( |
| 6 | + SELECT |
| 7 | + CustomerID, |
| 8 | + OrderID, |
| 9 | + OrderDate, |
| 10 | + TotalAmount, |
| 11 | + ROW_NUMBER() OVER (PARTITION BY CustomerID ORDER BY TotalAmount DESC) AS OrderRank |
| 12 | + FROM |
| 13 | + Orders |
| 14 | + WHERE |
| 15 | + OrderDate BETWEEN @startDate AND @endDate |
| 16 | + ), |
| 17 | + FrequentCustomers AS ( |
| 18 | + SELECT |
| 19 | + CustomerID, |
| 20 | + COUNT(*) AS TotalOrders, |
| 21 | + AVG(TotalAmount) AS AverageOrderAmount |
| 22 | + FROM |
| 23 | + Orders |
| 24 | + WHERE |
| 25 | + OrderDate BETWEEN @startDate AND @endDate |
| 26 | + GROUP BY |
| 27 | + CustomerID |
| 28 | + HAVING |
| 29 | + COUNT(*) > 5 |
| 30 | + ) |
| 31 | + SELECT |
| 32 | + R.CustomerID, |
| 33 | + R.OrderID, |
| 34 | + R.OrderDate, |
| 35 | + R.TotalAmount, |
| 36 | + R.OrderRank, |
| 37 | + F.TotalOrders, |
| 38 | + F.AverageOrderAmount |
| 39 | + FROM |
| 40 | + RankedOrders R |
| 41 | + INNER JOIN |
| 42 | + FrequentCustomers F ON R.CustomerID = F.CustomerID |
| 43 | + WHERE |
| 44 | + R.OrderRank = 1 |
| 45 | +) |
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