Question

我有这个sql：

SELECT 
     artists.id, 
     actors.id, 
     actors.count 
FROM 
     artists 
INNER JOIN actors ON artists.title = actors.title;

Actors表有重复和一些counter字段。可以有

Tom Waits | 10
Tom Waits | 30

如何更改我的第一个sql，以便它只返回那些有MAX(count)

的演员

像

这样的东西

SELECT 
     artists.id, 
     actors.id, 
     actors.count 
FROM 
     artists 
INNER JOIN actors ON artists.title = actors.title 
HAVING MAX(actors.count);

Answer 1

怎么样

SELECT  actors.id
        , MAX(actors.count)
FROM    artists 
        INNER JOIN actors ON artists.title = actors.title
GROUP BY
        actors.id

Answer 2

试试这个 -

SELECT artists.id, actors.id, actors.`count` FROM artists
  INNER JOIN actors
    ON artists.title = actors.title
  INNER JOIN (
    SELECT title, MAX(`count`) max_count FROM actors
      GROUP BY title
    ) actors2
    ON actors.title = actors2.title AND actors.`count` = actors2.max_count;

Answer 3

SELECT artists.id, a.id, a.count 
FROM artists 
INNER JOIN ( SELECT actors.id, actors.count 
             FROM actors
             HAVING MAX(actors.count) ) a ON artists.title = a.title

Answer 4

简单方法：

SELECT 
  artists.id, 
  (select actors.id 
   from actors 
   where artists.title = actors.title 
   order by actors.count desc Limit 1) 
  as actors_id,
  (select actors.count 
   from actors 
   where artists.title = actors.title 
   order by actors.count desc Limit 1) 
  as actors.count 
FROM 
  artists 
;

Answer 5

SELECT 
     artists.id, 
     actors.id, 
     MAX(actors.count) 
FROM 
     artists 
INNER JOIN actors ON artists.title = actors.title;
GROUP BY
    actors.id

加入了许多标准

5 个答案: