Sql 带条件的WHERE子句

我想检查WHERE子句中的值

如何将这个伪SQL代码转换成真正的SQL代码

声明@includeReserved int=0-可以是0、1或2 挑选* 从票上 哪里 -如果@includeReserved=0： 票务保留=0 -否则，如果@includeReserved=1： ticketIsReserved=0或ticketIsReserved=1 -如果@includeReserved=2： 票务保留=1 使用和或：

您可能希望包括：

or @includeReserved not in (0, 1, 2)

如果您不想筛选其他值。

请使用和或：

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听起来你想要这样的逻辑：

select *
from Tickets
where
    (@includeReserved = 0 and ticketIsReserved = 0) or
    (@includeReserved = 1 and ticketIsReserved in (0, 1)) or
    (@includeReserved = 2 and ticketIsReserved = 1);

---

尝试案例条件

declare @includeReserved int = 0 -- can be 0, 1 or 2

select *
from Tickets
where
case when (@includeReserved = 0 and ticketIsReserved = 0) then 1
     when (@includeReserved = 1 and (ticketIsReserved = 0 or ticketIsReserved = 1)) then 1 
     when (@includeReserved = 2 and ticketIsReserved = 1) then  end = 1

为什么？在WHERE子句中，您可以简单地使用AND和OR，如所有其他答案所示。

select *
from Tickets
where
    (@includeReserved = 0 and ticketIsReserved = 0) or
    (@includeReserved = 1 and ticketIsReserved in (0, 1)) or
    (@includeReserved = 2 and ticketIsReserved = 1);

declare @includeReserved int = 0 -- can be 0, 1 or 2

select *
from Tickets
where
case when (@includeReserved = 0 and ticketIsReserved = 0) then 1
     when (@includeReserved = 1 and (ticketIsReserved = 0 or ticketIsReserved = 1)) then 1 
     when (@includeReserved = 2 and ticketIsReserved = 1) then  end = 1