Question

想知道其他人将如何实现这一目标或最佳实践。我想在下面两个select语句之间总结SalesTotal和Transaction列，同时将第一个select语句中的值与其他所有语句相连;包括那些未包含在第二个select语句中的列到原始值。

我想避免使用游标或多条件逻辑。理想情况下，如果它可以在单个SQL语句中完成，那么它是首选还是不是？

SELECT Merchant, Department, SUM(SalesTotal) As 'SalesTotal', SUM(Transactions) As 'Transactions', FeeRate, SUM(Gross) As 'Gross', ((SUM(ItemA) * (1 - Rate)) * RateTwo) As 'Rate'
FROM Receipts a
    Where TransStatus = 1
Group By Merchant, Department, FeeRate, Rate, RateTwo

和

SELECT Merchant, Department, SUM(SalesTotal) As 'SalesTotal', SUM(Transactions) As 'Transactions'
FROM Receipts a
Where TransStatus = 2
Group By Merchant, Department

Answer 1

  SELECT (CASE WHEN TransStatus = 1 THEN Merchant ELSE 0 END) as 'Merchant' ,
   (CASE WHEN TransStatus = 1 THEN Department ELSE 0 END) as 'Department',
   (CASE  WHEN TransStatus = 1 THEN FeeRate ELSE 0 END) as 'FeeRate' , 
   SUM(CASE WHEN TransStatus = 1 THEN Gross ELSE 0 END) As 'Gross', 
   ((SUM(CASE WHEN TransStatus = 1 THEN ItemA ELSE 0 END) * (1 - Rate)) * RateTwo) As 'Rate'
   SUM(SalesTotal) As 'SalesTotal',
   SUM(Transactions) As 'Transactions'   
FROM Receipts
Group By Merchant, Department,
       CASE WHEN TransStatus = 1 THEN  FeeRate END,
       CASE WHEN TransStatus = 1 THEN  Rate END,
       CASE WHEN TransStatus = 1 THEN  RateTwo END

合并2个查询以计算2列

1 个答案: