delete from 表名 where 重复字段 in (select 重复字段 from 表名 group by 重复字段 having count(重复字段) > 1)and rowid not in (select min(rowid) from 表名 group by 重复字段 having count(重复字段)>1)
注解:“重复字段”为同一个字段。