mysql语句中的语法错误代码:1064

我不明白为什么它会抛出异常,花了我很多时间。我非常感谢你的帮助。

这是mysql语句

 use dvdrental;

Select S.city From S OS
Where EXISTS (select top(1) S.city, 
 Count(S.s_num) From S In S
 Where In S.city = OS.city Group By S.city 
 Order by Count(S.s_num) DESC)

例外是

  Error Code: 1064. You have an error in 
 your SQL syntax; check the manual that 
 corresponds to your MySQL server version 
for the right syntax to use near '.city, 
Count(S.s_num) From S In S Where In S.city = OS.city Group By S.city Orde' at line 2

谢谢您