如何在sql中重用子查询?
我有如下疑问如何在sql中重用子查询?,sql,sql-server,tsql,subquery,Sql,Sql Server,Tsql,Subquery,我有如下疑问 select columns from (select columns1 from result_set where condition_common and condition1) as subset1 join (select columns2 from result_set where condition_common and condition2) as subset2 on subs
select columns
from (select columns1
from result_set
where condition_common and condition1) as subset1
join
(select columns2
from result_set
where condition_common and condition2) as subset2
on subset1.somekey = subset2.somekey
我想以某种方式重复使用
select columns
from result_set
where condition_common
我把上面的查询过分简化了,但实际上上面的选择是巨大而复杂的。我不想承担确保两者同步的责任
我没有任何编程重用它的方法。T-SQL被排除在外。我只能写简单的查询。这是一个应用程序限制
如果您使用的是SQL Server 2005+,是否有办法在单个语句中重用相同的子查询
with cte as (
select columns
from result_set
where condition_common
)
select columns
from cte as subset1
join
cte as subset2
on subset1.somekey = subset2.somekey
where otherconditions
我所说的PLSQL只是指使用变量、过程等的能力。正确的术语是什么?谢谢。更正了。可能是重复的