MySQL中刪除重復數據只保留一條

一.刪除數據庫中的重復數據, 只留一條

-- 刪除數據庫中的重復數據只留一條
DELETE 
FROM
    crm_member 
WHERE
    id IN (
    SELECT
        a.id 
    FROM
        (
        SELECT
            id 
        FROM
            crm_member 
        WHERE
            phone IN ( SELECT phone FROM crm_member GROUP BY phone HAVING count( phone ) > 1 ) 
            AND id NOT IN ( SELECT min( id ) FROM crm_member GROUP BY phone HAVING count( phone ) > 1 ) 
        ) a 
    )