将where子句中的子查询移动到SQL Server中的表

Question

我必须使用此查询来获得前1个订单：

select  top 1 ID
From    MyTable
Where   userid = @userid
and     ((type = 'SomeValue1' and status in (1,2) and convert(date,create_date) < convert(date,getdate())) OR
         (type = 'SomeValue2' and status in (1,3) and convert(date,create_date) < convert(date,getdate())) OR
         (type = 'SomeValue2' and status not in (1,3) and convert(date,create_date) = convert(date,getdate())))
and     active = 1
order by convert(date,create_date)

有没有办法，我可以将条件移到第一个“ AND”之后的where子句中，将“ type”，“ status”和“ Create_Date”与表进行比较，然后在where子句中使用它？ 我要问的原因是，我必须做许多这样的比较，并且在一个查询中有30条不同的行会很笨拙。

另外，让我知道，如果我采用完全错误的方式。

提前致谢！

Answer 1

没有答案。 只有我的建议：

DECLARE @today date = cast(sysdatetime() AS date);

select top(1) ID
From    MyTable
Where   userid = @userid
and     ((type = 'SomeValue1' and status in (1,2) and cast(create_date AS date) < @today) OR
         (type = 'SomeValue2' and status in (1,3) and cast(create_date AS date) < @today) OR
         (type = 'SomeValue2' and status not in (1,3) and cast(create_date AS date) = @today))
and     active = 1
ORDER BY x
OPTION(RECOMPILE);

• 然后在userid ， type ， status和create_date WHERE active = 1上添加过滤索引