mysql:获取具有最大列值的别名的元组

Question

我想做的是:

select AlbumId from (
    select Album.AlbumId, Sum(Track.UnitPrice) as Total from Album 
    inner join Track on Album.AlbumId = Track.AlbumId
    group by Album.AlbumId
) tpt 
where Total = (select max(Total) from tpt);

但我得到:

Table 'db.tpt' doesn't exist

- 这可能是有道理的。但是，我是 SQL 新手，不知道为什么 tpt 超出了我的 where 子句的范围。我怎样才能实现这个目标？我想获取具有最大总数的元组并提取 AlbumId。

谢谢!

Answer 1

将 JOIN 与子查询结合使用。

select tpt.AlbumId from (
    select Album.AlbumId, Sum(Track.UnitPrice) as Total from Album 
    inner join Track on Album.AlbumId = Track.AlbumId
    group by Album.AlbumId
) tpt 
JOIN (
    select Sum(Track.UnitPrice) as Total from Album 
    inner join Track on Album.AlbumId = Track.AlbumId
    group by Album.AlbumId
    ORDER BY Total DESC
    LIMIT 1
) maxtpt ON tpt.Total = maxtpt.Total