MySQL ORDER BY（DESC | ASC）得到相同的结果

Question

In order to update a table of a tournament in HTML I do the following query:

SELECT p.pname, 
       team, 
       won, 
       tie, 
       lost, 
       goals, 
       goalsa 
FROM   player p, 
       stats s 
WHERE  p.tid = s.tid 
       AND p.pname = s.pname 
       AND p.tid = 23 
       AND p.groupno = 'A' 
ORDER  BY s.won, 
          s.tie, 
          ( s.goals - s.goalsa ), 
          s.goals, 
          p.pname DESC 

Where as the table player has the form

player (PName, TID, DraftNo, groupNo, team)

and the table stats the form

stats(won, tie, lost, goals, goalsA, PName, TID)

Currently, in stats there are following entries relevant for the query

0    0    0    0    0    a    23
0    0    0    0    0    c    23
0    0    0    0    0    e    23
1    0    0    2    1    g    23
0    0    1    1    2    i    23

which means that player g won against player i 2-1.

Now, no matter if I specify the ORDER BY option to DESC or ASC , I'm getting the following result:

i    Türkei    0    0     1     1     2
(...) 
g    Italien   1    0     0     2     1

which is exactly the opposite of what required. Why is this so? Is there an error in my query? Obviously I want to order the stats from the player with most points to players with less.

Answer 1

The ASC or DESC keyword applies only to the column it is placed beside in the ORDER BY , so you are doing a descending order by p.pname rather than by goals. You need to apply the DESC to goals and all other columns which should be sorted higher ( won ) for example, if you plan to do an aggregate like SUM(won) .

ORDER  BY s.won, 
      s.tie, 
      ( s.goals - s.goalsa ), 
      s.goals DESC, 
      p.pname 

A note about your joining method... You are using an implicit inner join, by supplying a comma-separated list in the FROM clause and the condition in the WHERE clause

FROM   player p, 
       stats s 
WHERE  p.tid = s.tid 

It is recommended to use an explicit INNER JOIN instead. The syntax is more modern and often considered easier to read. The two are equivalent functionally and in performance, however.

FROM  player p
      INNER JOIN stats s ON p.tid = s.tid

Answer 2

您需要在排序后的每个字段后加上DESC或ASC：

ORDER BY s.won DESC, s.tie DESC, ...