第1个回答 2011-09-26
Delete from tablename where id not in (select max(id) from
tablename group by col1,col2,...)本回答被提问者采纳
第2个回答 2011-09-13
select distinct 重复字段名称 FROM 表
第3个回答 2013-04-10
select distinct * into 新表名 from 原表
第4个回答 2011-09-13
select distinct * from dual