Mysql 如何通过重复键查找唯一行

我需要为一个特定的模型找到按汽车和颜色唯一的行，它有超过1种颜色

Car Model Color --------------------- Skoda Fabia Red Skoda Fabia Blue Skoda Fabia Red Skoda Octavia Red 但这不起作用。

我想你想要：

select distinct c.*
from cars c
where model = 'Fabia' and
      exists (select 1
              from cars c2
              where c2.model = c.model and
                    c2.car = c.car and
                    c2.color <> c.color
             );

试试这个：

SELECT distinct a.* FROM data as a 
JOIN 
(SELECT Car, Model,count(1)
 FROM data 
 GROUP BY Car, Model 
 HAVING count(1) > 1) as b
ON a.Model=b.Model AND a.Car=b.Car;

我有一个解决办法：

SELECT *,group_concat(DISTINCT Color) FROM data WHERE model='Fabia' GROUP BY Car HAVING count(DISTINCT Color)>1

---

从数据中选择*，组_concat（不同颜色），其中模型='Fabia'按车分组，计数（不同颜色）>1

从数据中选择汽车，模型，颜色，其中模型='Fabia'按车分组，模型，颜色计数（*）>1

定义不起作用？我假设您没有得到正确的结果，或者错误地只得到了一个完整的组？我可以得到很好的结果，但它们也显示了少于两个唯一记录的行。请记住，

group\u concat（…）

可能需要

设置会话组concat\u max\u len=红色Fabia

，因为内部SQL将在模型中查找重复的颜色->哦，我找到了，我实际上交换了字段名，让我更正它@雷蒙德尼兰德编辑了它

select distinct c.*
from cars c
where model = 'Fabia' and
      exists (select 1
              from cars c2
              where c2.model = c.model and
                    c2.car = c.car and
                    c2.color <> c.color
             );

select car, model, group_concat(distinct color)
from cars c2
where model = 'Fabia'
group by car, model
having count(distinct color) > 1;

SELECT distinct a.* FROM data as a 
JOIN 
(SELECT Car, Model,count(1)
 FROM data 
 GROUP BY Car, Model 
 HAVING count(1) > 1) as b
ON a.Model=b.Model AND a.Car=b.Car;

SELECT *,group_concat(DISTINCT Color) FROM data WHERE model='Fabia' GROUP BY Car HAVING count(DISTINCT Color)>1