原创 查找每個班級中成績最高的前三名
Student 字段 name ,classid,score class 字段 classid,name select a.name,b.name as class,score from student a,class b whe
Student 字段 name ,classid,score class 字段 classid,name select a.name,b.name as class,score from student a,class b whe