sql-server-2008 - 在带有用户输入的 where 语句中使用 Case

Question

我正在尝试添加所有可能的年度费用，但我的案例陈述并不正确。

如果我选择 2013 年，我希望能够将 2006 年到 2013 年的所有费用相加。有没有更好的方法可以在没有 Case 语句的情况下做到这一点？还是我走错路了。

 SELECT ID, Sum(Amount) As Total
FROM ABCD
WHERE Expenses = 'Actual' AND  
      AcountType = 'Expense' AND 
      CASE WHEN 'Myselectionparameter' = 2013 
           THEN ( YearID =2013 or YearID = 2012 or YearID = 2011 or YearID = 2010 or YearID = 2009 or YearID = 2008  Or YearID = 2007 or YearID = 2006 )
      END 
GROUP BY ID

Answer 1

那么Myselectionparameter是int参数吗？

SELECT ID, Sum(Amount) As Total
FROM   abcd 
WHERE  ... 
       AND ( @Myselectionparameter IS NULL 
              OR YearID BETWEEN 2006 AND @Myselectionparameter ) 
GROUP  BY id 

Answer 2

假设您的问题是关于参数的，在这种情况下，您在参数名称之前使用 @ 。

那么你有一个特定的答案......

SELECT ID, Sum(Amount) As Total
FROM ABCD
WHERE Expenses = 'Actual' AND  
      AcountType = 'Expense' AND 
      (@Myselectionparameter = 2013 AND YearID  BETWEEN 2006 AND 2013)
      END 
GROUP BY ID

如果参数说 2011 怎么办？你想从 2006 年到 2011 年吗？在这种情况下，你有一般的答案：

SELECT ID, Sum(Amount) As Total
FROM ABCD
WHERE Expenses = 'Actual' AND  
      AcountType = 'Expense' AND 
      YearID  BETWEEN 2006 AND @Myselectionparameter
GROUP BY ID