题目：要求:执行一个删除语句，当Name列上有相同时,只保留ID这列上值小的

表名：team
ID(number型) Name(varchar2型)
1 a
2 b
3 b
4 a
5 c
6 c
要求:执行一个删除语句，当Name列上有相同时,只保留ID这列上值小的
例如：删除后的结果应如下:
ID(number型) Name(varchar2型)
1 a
2 b
5 c

delete from team where id NOT IN(select a.c from (select min(id) as c from team GROUP BY name) as a)