Question

我有以下代码，我想使用union命令来组合它们。我尝试使用带有和不带最后一个表（12）的union命令。请提前告诉你。

DECLARE @COUNTER as int
SET @COUNTER = 0
WHILE @COUNTER < 12
  BEGIN
   SET @COUNTER = @COUNTER + 1
SELECT e.Month,e.Code,e.AVERAGE,f.AVERAGE
FROM ( SELECT     @COUNTER as Month,Clients.Clients_Code as Code, AVG(Transactions.Amount_of_indebtedness) as AVERAGE
  FROM         Account INNER JOIN
                      Clients ON Account.Account_Number = Clients.Account_Number INNER JOIN
                      Credit_Card ON Account.Account_Number = Credit_Card.Account_Number INNER JOIN
                      Transactions ON Credit_Card.Credit_Number = Transactions.Credit_Number
WHERE     (YEAR(Transactions.Date_and_time_of_transaction) = '2009') AND (MONTH(Transactions.Date_and_time_of_transaction) < @COUNTER)
GROUP BY Clients.Clients_Code)e,
  ( SELECT     @COUNTER as Month,Clients.Clients_Code as Code, AVG(Transactions.Amount_of_indebtedness) as AVERAGE
  FROM         Account INNER JOIN
                      Clients ON Account.Account_Number = Clients.Account_Number INNER JOIN
                      Credit_Card ON Account.Account_Number = Credit_Card.Account_Number INNER JOIN
                      Transactions ON Credit_Card.Credit_Number = Transactions.Credit_Number
WHERE     (YEAR(Transactions.Date_and_time_of_transaction) = '2009') AND (MONTH(Transactions.Date_and_time_of_transaction) >= @COUNTER)
GROUP BY Clients.Clients_Code)f
WHERE f.Code=e.Code AND e.Month=f.Month AND f.AVERAGE>e.AVERAGE

END

Answer 1

你不能。

你能做的是：

将结果插入#temp表或表变量，然后从最后选择
使用cte或temp表来生成所需的数字，然后执行单个查询，而不是使用while循环。

如何在内部使用union？（SQL）

1 个答案: