基于子查询的两个条件。如何缩短它？

Question

我有基于 2 个子查询的工作查询。

SELECT * FROM database1
where account_id in (SELECT account_id FROM (select account_id,transaction_id from ... here i have my big sql query))
and transaction_id in (SELECT transaction_id FROM (select account_id,transaction_id from ... here i have my big sql query))

我想知道如何做才能不必粘贴 2 次我的大 sql 查询而只在一行中使用这两个条件？这可能吗？

Answer 1

我猜你真的想要：

select d.*
from database1 d
where exists (select 1
              from <big query here> q
              where q.account_id = d.account_id and
                    q.transaction_id = d.transaction_id
             );

与您的查询不同，这保证了两列在您的查询中位于同一行。这不是您查询的目的，但我猜这是您的意图。

如果你真的想检查其中任何一个是否发生在任何地方，那么你可以使用 CTE：

with q as (
      <your query here>
     )
select d.*
from database1 d
where exists (select 1 from q where q.account_id = d.account_id) and
      exists (select 1 from q where q.transaction_id = d.transaction_id);

基于子查询的两个条件。如何缩短它？

Two conditions based on subquery. How to shorten it?

sql

subquery