Inner Join（Select。From）

Question

我需要获取用户发布的最后一条记录。下面的下面的查询会得到我需要的信息，如果我想，如果我可以按组之前

select a.client_id, a.client, b.title, b.type, b.created 
    from profile_users a, node b 
where a.uid = b.uid 
    and b.type = 'event' 
    and a.status=1 
    and a.client_id in (select c.client_id 
         from profile_users c, follows d 
         where c.uid = d.followed_id 
          and d.following_id =3) 
group by a.client_id 
order by a.client_id, 
      b.created desc 

我尝试使用内部联接重写查询，但没有得到期望的结果做订单。我需要编写这个查询，以便在检查下表中的记录后获取client_id。我需要一些帮助来解决这个问题。

select b.client_id, b.client, a.title, a.created 
    from node a 
inner join profile_users b on a.uid=b.uid 
inner join (select c.client_id 
       from profile_users c 
       inner join follows d on c.uid=d.followed_id 
       where c.status = 1 
       and d.following_id = 3 
       order by c.client_id 
      ) as X1 

Answer 1

使用sql“分区依据”它可以让你排序你的记录没有分组。

http://learnsqlserver.in/2/Partition-By-Clause.aspx

最好的做法是使用过组。

Answer 2

您需要，以确定过去后使用联合相关子查询：

select a.client_id, a.client, b.title, b.type, b.created 
    from profile_users a 
    join node b on a.uid = b.uid 
where b.type = 'event' 
    and a.status=1 
    and a.client_id in (select c.client_id 
         from profile_users c 
          join follows d on c.uid = d.followed_id 
         where d.following_id = 3) 
    and b.created = (select max(n2.created) 
        from node n2 
        where n2.uid = a.uid) 
order by a.client_id, 
      b.created desc 

我也改变了旧的风格含蓄的where子句使用“加入”关键字明确那些在加入。