当@ filter = 1 ....时，是否可以写出where case？

Question

使用

• SQL server 2005
• 程序
• 参数

我有一个正常的查询：

select column1, column2
from table1
where column3 in ( select columnb from table2 )

现在我有一个过滤器，例如int

declare @filtertype int /*@filtertype=1 then column3,@filtertype=2 then column2*/ 
set @filtertype int

我这样做了

select column1, column2
from table1
where
   case when @filtertype=1 then (column3 in (select columnb from table2))
   else (column2 in (select columnb from table2))

如果您看到它，您可以看到第2列的第3列

的唯一更改

我不想像这样重复我的大型查询：

if(@filtertype=1)
begin
   first query
end
else
   other query
begin
end

Answer 1

试试这个：

   select column1, column2 
    from table1 
    where 
    (@filtertype=1 AND (column3 in (select columnb from table2)))
    OR
    (@filtertype=2 AND (column2 in (select columnb from table2)))

Answer 2

select 
...
from ...
where (@filtertype=1 and column3 in (select ... from table2))
or (@filtertype<>1 and column2 in (select ... from table2))