如何重用IN子查询的查询？

Posted 2023-04-14

【中文标题】如何重用IN子查询的查询？

【英文标题】：How to reuse query of IN sub query?

【发布时间】：2016-09-13 05:27:10

【问题描述】：

我有以下查询

select a.id, a.user_id, a.approver_id, a.second_approver_id 
from tbl_approve_master a 
WHERE user_id in (select id from tbl_user where name like '%john%')
or approver_id in (select id from tbl_user where name like '%john%') 
or second_approver_id in (select id from tbl_user where name like '%john%') 

如何重用 in 的查询语句？我尝试了How to reuse a sub query in sql?作为接受答案

with cte as (select id from tbl_user where name like '%john%')
select a.id, a.user_id, a.approver_id, a.second_approver_id 
from tbl_approve_master a 
WHERE user_id in cte
or approver_id in cte 
or second_approver_id in cte

但这不行。我怎样才能实现它？

【参考方案1】：

试试这个：

select a.id, a.user_id, a.approver_id, a.second_approver_id 
from tbl_approve_master a 
WHERE exists (
    select * 
    from tbl_user u
    where u.name like '%john%'
    and u.id in (a.user_id, a.approver_id, a.second_approver_id)
)

【讨论】：

谢谢先生。这就是我要找的。​​span>

【参考方案2】：

你可以这样试试：

select a.id, a.user_id, a.approver_id, a.second_approver_id 
from tbl_approve_master a
where exists (select 1 from tbl_user at
              where (a.user_id  = at.id
                or a.approver_id  = at.id
                or a.second_approver_id =id)
                and (at.name like '%john%'))

【参考方案3】：

试试这个查询。

;with cte as (select id from tbl_user where name like '%john%')
select a.id, a.user_id, a.approver_id, a.second_approver_id 
from tbl_approve_master a 
join cte 
    on user_id = cte.id or approver_id = cte.id or second_approver_id = cte.id

【讨论】：

我得到了重复的结果。