SQL 服务器 Select 不同字段值的 where 条件不同

Question

我想从我的 table offer 中获取 select 数据，其中有一个名为 type 的字段，我需要对每种类型应用不同的条件。

代码可能如下所示：

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,

那么我该如何实现呢？

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`

SQL 服务器 Select 不同字段值的 where 条件不同

SQL Server Select with different where conditions for different field values

sql

sql-server

select

conditional

where-clause