同一張表中刪除重複數據

同一張表中，假設以兩個字段做唯一業務,這兩個字段分別爲key1，key2,

則以這兩個字段爲唯一

DELETE tablename FROM
    t_price_insignt_profit ,
    (
        SELECT
            min(id) id,
           key1, key2
        FROM
            tablename 
        GROUP BY
            
            key1, key2
        HAVING
            count(*) > 1
    ) t2
		WHERE
 tablename .key1=t2.key1 
AND tablename .key2=t2.key2
AND tablename .id > t2.id;