mysql - MySQL 更新排名和关系

Question

我有下表：

Rank  RankTies  TeamName  WinningPercentage
                TeamA     1000
                TeamB     1000
                TeamC     500
                TeamD     250
                TeamE     250
                TeamF     250
                TeamG     0

我想使用存储的例程按 WinningPercentage DESC 对这些进行排名，因此更新后的表应该是：

Rank  RankTies  TeamName  WinningPercentage
1     2         TeamA     1000
1     2         TeamB     1000
3     1         TeamC     500
4     3         TeamD     250
4     3         TeamE     250
4     3         TeamF     250
7     1         TeamG     0

我可以使用临时表来做到这一点，但有没有更优雅的解决方案，比如一个 UPDATE 语句？

Answer 1

SQLFiddle 演示

(select * from T) T2当您不能在子查询中使用更新表时，这里避免 MySQL 限制：( "You can't specify target table 'T' for update in FROM clause")

update T T1 set RankTies=(select count(*) from 
                            (select * from T) T2 
                            where T2.WinningPercentage=T1.WinningPercentage),

Rank=(select count(*)+1 from 
                            (select * from T) T2 
                            where T2.WinningPercentage>T1.WinningPercentage)