MySQL选择列值的最大计数

Question

I have table called Euro_Cup.

[enter image description here][1]

Group   Country Rank    Jersey  Position    Age Selections  Club    Player
A   Brazil  3   18  Midfielder  29  24  Internazionale      Hernanes
A   Cameroon    56  18  Midfielder  28  38  Antalyaspor     Eyong Enoh
A   Croatia 18  18  Forward 34  92  VfL Wolfsburg   Ivica Olic
A   Mexico  20  18  Defender    27  104 Bayer Leverkusen    Andres Guardado
B   Australia   62  18  Goalie  32  8   Adelaide United     Eugene Galekovic
B   Chile   14  18  Defender    28  65  Nottingham Forest   Gonzalo Jara
B   Spain   1   18  Defender    25  26  Barcelona       Jordi Alba
B   Netherlands 15  18  Midfielder  24  6   Norwich City    Leroy Fer

I have to write a SQL query to group the player by their jersey number and then, for each jersey number group, return the most common position for that jersey number.

Eg Jersey number 18 has 3 Midfilders, 8 defender and 2 Goalie then result should jersey number 18 , defender (bcos max player with jersey number number 18)

I have tried

 select jersey,position,count(position) as cnt 
 from euro_cup2
 group by jersey,position 
 having count(position) in 
                       (select max(cnt) from   (select jersey,position,count(position) as cnt 
                      from euro_cup2
                       group by jersey,position)a)

But it does not work. Any help would be highly appreciated

Answer 1

I reviewed all your comments, this will give you what you search:

SELECT
euro_cup2.jersey,
a.position,
MAX(cnt) as count
FROM euro_cup2
LEFT JOIN
(SELECT
   jersey,
   position,
   (COUNT(position)) AS cnt 
   FROM euro_cup2
   GROUP BY jersey,position) AS a ON euro_cup2.jersey=a.jersey
GROUP BY jersey;

Here the result:

Regards

Answer 2

Try this one, should work

   SELECT Jersey,
   Group_concat(Position separator ','),
   Group_concat(CountOfPosition separator ',')
   FROM   (SELECT euro_cup.Jersey,
           euro_cup.Position,
           Count(euro_cup.Position) AS CountOfPosition
    FROM   euro_cup
    GROUP  BY euro_cup.jersey,
              euro_cup.Position) a
   WHERE  CountOfPosition = (SELECT Max(CountOfPosition)
                     FROM   (SELECT euro_cup.jersey,
                                    euro_cup.Position,
                                    Count(euro_cup.Position) AS      CountOfPosition
                             FROM   euro_cup
                             GROUP  BY euro_cup.jersey,
                                       euro_cup.Position) b
                     WHERE  a.jersey = b.jersey)
     GROUP  BY Jersey