Php MySQL如何在分组行之前对行进行排序？

我试图为每个尺寸、品牌和种类返回一行，但有时会有多行具有完全相同的值，除了

enddate

我想返回具有最高

enddate

（Order by

enddate

desc）的行不起作用

SELECT 
    promotion.id,
    promotion.uid,
    promotion.promotion_id,
    promotion.url,
    promotion.shop_id,
    promotion.brand_kind_id,
    promotion.before_price,
    promotion.after_price,
    promotion.brand_id,
    promotion.brand_package_id, 
    promotion.brand_size, 
    promotion.amount, 
    promotion.begindate,
    promotion.enddate

FROM 
    `promotion`     

WHERE 
    AND (promotion.url is not null AND promotion.url != '')

GROUP BY 
    promotion.brand_id,
    promotion.brand_kind_id,
    promotion.brand_size

ORDER BY 
    promotion.enddate DESC

---

如果特定的问题是某些行具有不同的结束日期，我建议从select字符串中删除结束日期。这意味着不考虑具有不同结束日期的行

另一个选项可能是选择最大结束日期，您可以尝试以下操作：

SELECT 
    promotion.id,
    promotion.uid,
    promotion.promotion_id,
    promotion.url,
    promotion.shop_id,
    promotion.brand_kind_id,
    promotion.before_price,
    promotion.after_price,
    promotion.brand_id,
    promotion.brand_package_id, 
    promotion.brand_size, 
    promotion.amount, 
    promotion.begindate,
    MAX(promotion.enddate)
FROM 
    `promotion`     
WHERE 
    AND (promotion.url is not null AND promotion.url != '')
GROUP BY 
    promotion.brand_id,
    promotion.brand_kind_id,
    promotion.brand_size
ORDER BY 
    promotion.enddate DESC

但是，如果您打算使用结束日期作为数据，我只推荐这种方法