Question

我有一个我正在处理的查询，基本上我有3列：

Code: The users Code
Orders Taken: The orders which have been taken
Orders Taken From an External Call

基本上我只需要一种方法只允许Orders From External Calls有一个where子句，当我添加我的WHERE子句时，它会为两个表做。

到目前为止我的查询：

SELECT T_Temp_RestrictedDiaryCalls.AccreditedDomainCode, 
    Count(T_Temp_RestrictedProductSalesHistory.CustomerCode) AS [Orders Taken],
    Count(T_Temp_RestrictedProductSalesHistory.CustomerCode) AS [Orders From External Calls]

    FROM T_Temp_RestrictedDiaryCalls 
        INNER JOIN T_Temp_RestrictedProductSalesHistory 
            ON (T_Temp_RestrictedDiaryCalls.CustomerCode = T_Temp_RestrictedProductSalesHistory.CustomerCode) 
            AND (T_Temp_RestrictedDiaryCalls.CallDate = T_Temp_RestrictedProductSalesHistory.EntryDate)

    GROUP BY T_Temp_RestrictedDiaryCalls.AccreditedDomainCode;

非常感谢任何帮助。

Answer 1

如果我做得对，你应该在[Orders From External Calls]定义中使用CASE语句：

SELECT T_Temp_RestrictedDiaryCalls.AccreditedDomainCode, 
    Count(T_Temp_RestrictedProductSalesHistory.CustomerCode) AS [Orders Taken],
    sum( CASE WHEN <Your condition here>  
              THEN 1 
              ELSE 0
          END) AS [Orders From External Calls]

    FROM T_Temp_RestrictedDiaryCalls 
        INNER JOIN T_Temp_RestrictedProductSalesHistory 
            ON (T_Temp_RestrictedDiaryCalls.CustomerCode = T_Temp_RestrictedProductSalesHistory.CustomerCode) 
            AND (T_Temp_RestrictedDiaryCalls.CallDate = T_Temp_RestrictedProductSalesHistory.EntryDate)

    GROUP BY T_Temp_RestrictedDiaryCalls.AccreditedDomainCode;

Answer 2

如果我理解正确，您希望这两个Orders列都计算来自同一个表的数据，但对表中的哪些记录进行计数以及哪些记录不计数有不同的限制。所以做一些像：

SELECT T_Temp_RestrictedDiaryCalls.AccreditedDomainCode, 
    Count(SalesHistoryForAllOrders.CustomerCode) AS [Orders Taken],
    Count(SalesHistoryForExternalOrders.CustomerCode) AS [Orders From External Calls]

    FROM T_Temp_RestrictedDiaryCalls 
        INNER JOIN T_Temp_RestrictedProductSalesHistory SalesHistoryForAllOrders 
            ON (T_Temp_RestrictedDiaryCalls.CustomerCode = SalesHistoryForAllOrders.CustomerCode) 
            AND (T_Temp_RestrictedDiaryCalls.CallDate = SalesHistoryForAllOrders.EntryDate)
        INNER JOIN T_Temp_RestrictedProductSalesHistory SalesHistoryForExternalOrders 
            ON (T_Temp_RestrictedDiaryCalls.CustomerCode = SalesHistoryForExternalOrders.CustomerCode) 
            AND (T_Temp_RestrictedDiaryCalls.CallDate = SalesHistoryForExternalOrders.EntryDate)

    GROUP BY T_Temp_RestrictedDiaryCalls.AccreditedDomainCode;

说明：

通过INNER连接表格两次并且每次别名，我们现在有两个单独的表格表示（称为SalesHistoryForAllOrders和SalesHistoryForExternalOrders）。

然后，您可以自由地放置一个WHERE子句，该子句分别引用其中任何一个，并且它只会影响该列，而不会影响另一个列。所以要么：

WHERE SalesHistoryForExternalOrders.IsAnExternalOrder > 0

或者只是在第二个INNER JOIN中添加一个AND：

AND SalesHistoryForExternalOrders.IsAnExternalOrder > 0

，结果相同：该子句仅应用于External Calls列。

Answer 3

根据您在评论中所说的内容，一列可能包含所有行的计数，而其他列只显示指定大小写的值。

所以：

select table1.a,count(table1.b),
(select count(table2.c) from table2 where "where clause")
 from table1

将WHERE子句添加到单个列

3 个答案:

说明：