Sql 在WHERE子句中使用带BETWEEN的大小写

我试图用case语句编写一个where子句，该语句将查看@TimeType，然后只返回那些时间范围之间的行。所以基本上我有三次（早上、下午和晚上）。我在使用between时遇到语法错误。开始时间字段是sql时间数据类型。以下是我目前掌握的情况：

declare @TimeType int

select * from events
where
start_time = case 
when @TimeType = 0 then start_time between '00:00:00' and '11:59:00' 
when @TimeType = 1 then start_time between '12:00:00' and '16:59:00' 
when @TimeType = 2 then start_time between '17:00:00' and '23:59:00' 
end

---

只需使用常规逻辑：

select e.* 
from events e
where (@TimeType = 0 and start_time between '00:00:00' and '11:59:00') or
      (@TimeType = 1 then start_time between '12:00:00' and '16:59:00') or 
      (@TimeType = 2 then start_time between '17:00:00' and '23:59:00');

---

通常，不鼓励在

where

子句中使用

case

表达式，因为这会妨碍优化器。这可能更难理解。通常，相同的逻辑可以使用基本布尔逻辑来表示。

您可以在

中使用布尔逻辑，其中
子句：

WHERE (@TimeType = 0 AND start_time between '00:00:00' and '11:59:00') OR
      (@TimeType = 1 AND start_time between '12:00:00' and '16:59:00') OR
      (@TimeType = 2 AND start_time between '17:00:00' and '23:59:00')