如何检查具有多个条件的SQL CASE？

Question

我有两张桌子。账户ACC和FinancialTrans FT

FinancialTrans表如下：

AcctID  TransTypeCode   DateOfTrans
123     TOLL            2016-06-06 00:00:00.000
123     TOLL            2016-06-02 00:00:00.000
123     TOLL            2016-04-28 00:00:00.000
123     PYMT            2016-03-11 00:00:00.000
123     TOLL            2015-12-22 00:00:00.000
123     TOLL            2015-12-22 00:00:00.000

要求是： 当任何账户在过去两年没有'TOLL'或'PYMT'时打印'Flag'

SELECT ACC.Field1
      ,ACC.Field2
      ,ACC.Field3
      ,ACC.Field4
      ,CASE WHEN  
        (SELECT Max(DateOfTrans) FROM FinanceTrans FT
         WHERE ACC.AccountID = FT.AcctID
               AND (TransTypeCode = 'TOLL' AND DateOfTrans >= DATEADD(year, -2, GETDATE()))
               AND (TransTypeCode = 'PYMT' AND DateOfTrans >= DATEADD(year, -2, GETDATE()))
             GROUP BY AcctID, TransTypeCode) IS NULL
        THEN 'Flag'
        ELSE ''
       AND AS NoNo_Flag

FROM Accounts ACC

WHERE Condition 1, Condition 2...

Answer 1

所以这就是我解决这个问题的方法：

我为每个创建了一个单独的列，然后将这些详细信息存储在临时表中。 然后我使用条件从临时表中提取数据以创建标志。

我的代码如下：

SELECT ACC.Field1
      ,ACC.Field2
      ,ACC.Field3
      ,ACC.Field4
      ,(SELECT Max(DateOfTrans) FROM FinanceTrans FT
        WHERE ACC.AccountID = FT.AcctID
          AND TransTypeCode = 'TOLL'
        GROUP BY AcctID, TransTypeCode) LastTollDate
      ,(SELECT Max(DateOfTrans) FROM FinanceTrans FT
        WHERE ACC.AccountID = FT.AcctID
          AND TransTypeCode = 'PYMT'
        GROUP BY AcctID, TransTypeCode) LastPymtDate

INTO #Temp_Data

FROM Accounts ACC

WHERE Condition 1, Condition 2...



SELECT ACC.Field1
      ,ACC.Field2
      ,ACC.Field3
      ,ACC.Field4
      ,CASE WHEN LastTollDate >= DATEADD(year, -2, GETDATE())
        AND LastPymtDate >= DATEADD(year, -2, GETDATE())
        THEN 'Flag'
        ELSE ''
       END AS Flag

FROM #Temp_Data