mysql - 在子查询中访问父查询变量

Question

我有一个看起来像这样的 mysql 查询

select 
    s.id, sum(history.virality)
from
    spreads s , (
                select 
                     ( ( (sum(t.likes)) + ( sum(t.comments)) ) * ( 1 / ( 1 +  s.created_at  / 3600000 ) ) )as response
                from
                    spreadstimeline t
                where
                    t.spread_id = s.id
                group by
                    DATE_FORMAT(t.created_at,'%Y-%m-%d %H')
            ) as history
group by
    s.id

Mysql返回错误“'字段列表'中的未知列's.created_at'”

有没有办法让 s 出现在子查询中，或者我应该开始考虑不同的查询。

Answer 1

也许是这样的：

select 
    s.id, sum_virality, ( ( (sum_likes) + ( sum_comments) ) * ( 1 / ( 1 +  s.created_at  / 3600000 ) ) )as response
from spreads s
inner join (select t.spread_id, DATE_FORMAT(t.created_at,'%Y-%m-%d %H') created_date, sum(t.virality) sum_virality, sum(t.likes) sum_likes, sum(t.comments) sum_comments
            from spreadstimeline t
            where t.spread_id = s.id
            group by created_date) as history
group by
    s.id