sql 去重 查找并删除重复记录而且只留一条记录

1.支持单条件或者多条件，查找重复记录，语句：sql select * from stock a where (a.state,a.org_id,a.material_id) in (select state,org_id,material_id from stock where state = 1 group by state,org_id ,material_id having c

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