如果你需要的是删除数据库中的数据:
delete from table a
where (a.user_id,a.tw_id) in (select user_id,tw_id from vitae group by user_id,tw_id having count(*) > 1)
and rowid not in (select min(rowid) from vitae group by user_id,tw_id having count(*)>1)
如果只是查出是去重:
select distinct user_id,tw_id from table
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