php - 基于结果的选择中选择 MySQL

Question

我有一张 table ，例如

Artist     Title      Song Key
A          Title A    A
A          Title A    B
A          Title A    F
B          Title B    A

我想返回每首歌曲，但也显示该歌曲有多少个版本，例如理想的结果是:

Artist     Title       How_many
A          Title A     3
B          Title B     1

这就是我正在尝试的，但计数计算所有轨道，而不仅仅是当前行:

SELECT *, 
       ( select count(*) 
           from tracks 
          where artist=artist 
            AND title=title ) as How_many 
  from tracks
 where easytosing='Yes'
 group by title, artist
 order by track_id desc

使用嵌套查询可以实现这一点吗？或者有更好的方法吗？

Answer 1

试试这个:

SELECT Artist, title, count(*) as How_many 
FROM tracks
WHERE easytosing='Yes'
GROUP BY Artist,Title