.net - 您尝试执行不包含指定表达式的查询错误

Question

我有一个以下查询

SELECT 
   MonthNumber, 
   Sum(PhaseCost) AS PC, Sum(TotalCost) TC,
   PC / (TC-PC) AS PER 
FROM 
   Table1 
JOIN  
   Table2 ON Table1.MonthNumber = Table2.MonthNumber 
GROUP BY  
   MonthNumber

它工作正常并在 MS Access 中返回一条记录，但是当我尝试从 .Net 调用相同的记录时，我收到此错误

You tried to execute a query that does not include the specified expression PC/(TC-PC), And SUM(PC/(TC_PC)) is not allowed.

这是怎么回事？

Answer 1

您不能以这种方式引用PC 和TC。您必须使用他们的计算来代替他们的别名。

它应该写成:

SELECT MonthNumber, 
Sum(PhaseCost) AS PC, 
Sum(TotalCost) AS TC, 
Sum(PhaseCost)/(Sum(TotalCost)-Sum(PhaseCost)) AS PER 
FROM Table1 Join Table2 ON Table1.MonthNumber = Table2.MonthNumber 
Group By MonthNumber

免责声明:我没有测试此 SQL。