mysql刪除重複記錄只保留一條（最簡單）

查找出這三個字段重複的數據只保留一條，其餘的全部刪除   sql語句： DELETE FROM jxkh_evaluation_detail WHERE id NOT IN (SELECT id from ( SELECT min(id) AS id FROM jxkh_evaluation_detail GROUP BY project_id, lib_item_id,obj_id)a) 

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