sql 去重 查找並刪除重複記錄而且只留一條記錄

1.支持單條件或者多條件，查找重複記錄，語句：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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