mysql：条件付きの繰り返し値を持つ行を削除します（繰り返し列）

あなたはこれを探しているはずです：

ここでは、key record values (date + name)を省略しています。 それらは、サッカーをしたkey record values (date + name) who played football およびkey record values (date + name) who did not play football

SELECT 
    p1.*
FROM
    player p1
        LEFT JOIN
    (SELECT 
        pnfb.*
    FROM
        (SELECT 
        date, name
    FROM
        player
    WHERE
        sport <> 'football') pnfb
    JOIN (SELECT 
        date, name
    FROM
        player
    WHERE
        sport = 'football') pfb ON (pnfb.date = pfb.date
        AND pnfb.name = pfb.name)) p2 ON (p1.date = p2.date AND p1.name = p2.name)
WHERE
    p2.date IS NULL;