查找表中多余的重复记录（多个字段）
select * from answers
where (question_content,options,answers) in (select question_content,options,answers from answers group by question_content,options,answers having count(*) > 1) order by question_content
删除表中多余的重复记录（多个字段），只留有rowid最小的记录
delete from answers
where (question_content,options,answers) in (select question_content,options,answers from answers group by question_content,options,answers having count(*) > 1)
and rowid not in (select min(rowid) from answers group by question_content,options,answers having count(*)>1)
sql代码参考：
SQL删除重复数据只保留一条_anya的专栏-CSDN博客_sql删除重复数据只保留一条
