SQL Server根据不同字段值的条件，选择不同的字段值

Question

我想从我的表offer中选择数据，其中有一个字段名为type，我需要对每种类型应用不同的条件。

代码可能是这样的：

select * from offer where 
if type = 1 then apply condition_1, 
else if type = 2 then apply condition_2 and condition_3, 
else if type = 3 then apply condition_4, 

所以，我怎么能做到这一点？

Answer 1

select * from offer 
where (type =1 and condition_1) 
or (type = 2 and condition_2 and condition_3) 
or (type = 3 and condition_3) 

Answer 2

select * from offer 
where CASE WHEN [type] = 1 then condition_1 
      WHEN [type] = 2 then (condition_2 and condition_3) 
      WHEN [type] = 3 then apply condition_4 END`