Question

我对SQL不太满意，并希望做一些我认为相当简单的事情。以下查询返回一列的一列ID：

select distinct(email_campaign_id) 
    from hubspot.email_events a
where a.subject in ('subject1', 'subject2', 'subject3')

我想在另一个查询中使用此列ID，如下所示：

with relevant_ids as
  (
  select distinct(email_campaign_id) 
      from hubspot.email_events a
  where a.subject in ('subject1', 'subject2', 'subject3')
  )

select * 
  from hubspot.email_events a
where a.email_campaign_id in relevant_ids

然而这会引发错误：

ERROR: syntax error at or near "relevant_ids"

我在这里做错了什么？我使用'with'是不正确的？

Answer 1

只需：

select * 
  from hubspot.email_events a
where a.email_campaign_id in (   
                               select distinct(email_campaign_id) 
                               from hubspot.email_events a
                               where a.subject in ('subject1', 'subject2', 'subject3')
)

如果你想使用CTE，你必须在没有指定列名的情况下在CTE中命名列，但在你的情况下，它很好，如：

with relevant_ids as
  (
  select distinct(email_campaign_id) --as COLUMNNAME 
      from hubspot.email_events a
  where a.subject in ('subject1', 'subject2', 'subject3')
  )

select * 
  from hubspot.email_events a
where a.email_campaign_id in (SELECT COLUMNNAME from relevant_ids)

Answer 2

您必须在var_dump：

中使用SELECT查询

IN

Answer 3

或者只是加入你的cte

  with relevant_ids as
  (
      select distinct(email_campaign_id) 
         from hubspot.email_events a
      where a.subject in ('subject1', 'subject2', 'subject3')
  )

select * 
  from hubspot.email_events a 
 join relevant_ids ri on ri.email_campaign_id = a.email_campaign_id

在SQL查询中，使用where子句过滤另一个查询结果

3 个答案: