Question

我想修改下面给出的现有SQL查询（编号1）。首先，我需要知道是否有可能做我想做的事（第2号）。如果是，那么我可以做什么。

--**(Number 1)** What I currently have      

SELECT  Column1
    FROM  dbo.Table1
    WHERE ColumnValue1 = 'One'
    AND scalarFunctionResult(Var) = 'Word1'
    AND ColumnValue2 = "Word2"


--*(Number 2)* What I need      
SELECT  Column1
    FROM  dbo.Table1
    WHERE ColumnValue1 = 'One'
    AND SomeVariable IN (scalarFunctionResult(Var) = 'Word1', 'WordA')
-- Perform a query based 
--on value of SomeVariable, Please read pseudo code below 
    AND ColumnValue2 = "Word2"

--Pseudo code for logic
--if(SomeVariable = 'Word1') then run query ABCD,
--else if(SomeVariable = 'WordA') then run some other query EFGH

Answer 1

这是一个简单的OR

SELECT Column1
  FROM dbo.Table1
 WHERE ColumnValue1 = 'One'
   AND ((@SomeVariable = 'Word1' AND <the condition ABCD>)
        OR
        (@SomeVariable = 'WordA' AND <the condition EFGH>))

实际上，您可以在@Somevariable = 'Word1'时从ABCD获得结果，或在@Somevariable = 'WordA'时从其他条件“查询”EFGH获得结果。

e.g。

SELECT Column1
  FROM dbo.Table1
 WHERE ColumnValue1 = 'One'
   AND ((dbo.scalarFunctionResult(@SomeVariable) = 'Word1' AND ColumnValue2 = "Word2")
        OR
        (dbo.scalarFunctionResult(@SomeVariable) = 'WordA' AND ColumnValue3 = "Word3"))

Answer 2

您是否正在尝试弄清楚如何在SQL中创建IF语句？我不确定我是否理解你的问题。

如果是这样，这里是来自MSDN的引用。在这种情况下你可能不需要它，尽管RichardTheKiwi表示。

需要帮助来修改我的SQL查询

2 个答案: