Question

我有两张桌子：

AppDetailFee table has AppID (PK), TypeID, Amount
AppDetail table has AppID (PK)

我在AppID上加入两个表，我需要检查以下是否有TypeID和金额。有3种情况：

If TypeID = 6 and Amount = 0 then  print appid and amount zero
If typeID = 6 and amount <> 0  - bypass and do not print
When TypeID <> 6 then print zero

下面是我使用的代码，btu我得到的所有行的结果都不等于零，数量为零。

任何帮助将不胜感激。感谢

SELECT  ad.AppID
      , MAX(case when (adf.TypeID = 6 AND adf.Amount = 0) then 0 
                 when (adf.TypeID = 6 AND adf.Amount <> 0) then Adf.Amount
       ELSE 0 END) AS FeeAmount

FROM         
      AppDetail AS ad   

inner join  AppDetailFee adf ON
      ad.AppID = adf.AppID 

WHERE  adf.Amount =0

Answer 1

您有WHERE子句删除了不符合条件的所有内容：

WHERE  adf.Amount =0

尝试删除并运行查询：

SELECT  ad.AppID
      , MAX(case when (adf.TypeID = 6 AND adf.Amount = 0) then 0 
                 when (adf.TypeID = 6 AND adf.Amount <> 0) then Adf.Amount
                 else 0 END) AS FeeAmount
FROM  AppDetail AS ad   
inner join  AppDetailFee adf ON
      ad.AppID = adf.AppID 
group by ad.AppID

您还缺少查询中的GROUP BY子句。

案例 - 何时加入表格时

1 个答案: