小编gia*_*cum的帖子

有没有办法知道我的 SQL SERVER DB 2014 中的兼容性级别是否已更改？

我需要你的帮助，我需要一些指导来提高以下给定视图的性能。

我有一个用以下代码编写的视图：

with timeframes  as
(
select p.SEARCH_NUM, 
case   when p.FROM_DATE is not null then p.FROM_DATE
       when p.FROM_DATE is null and P.SEARCH_DAYS is not null and p.TO_DATE is not null then DATEADD(day,p.SEARCH_DAYS*-1,p.TO_DATE)
       when p.FROM_DATE is null and P.SEARCH_DAYS is not null and p.TO_DATE is null then DATEADD(day,p.SEARCH_DAYS*-1,GetDate()) 
       when p.FROM_DATE is null and P.SEARCH_DAYS is null and p.TO_DATE is not null and p.DURATION = 'Yearly' then DATEADD(year,-1,p.TO_DATE)
       when p.FROM_DATE is null and P.SEARCH_DAYS is null and p.TO_DATE is null and p.DURATION …