在Mysql中查找重复的型号

Question

我有一个拥有近400,000条记录的MySQL表。

我想列出所有重复的Model_Number

我尝试了以下2个查询，MySQL只是继续加载并挂起.AZ_Code＆＃39;是SKU

查询应该返回所有记录而不是单个记录

select p1.AZ_Code from dumpdata as p1
join dumpdata as p2 on
(p1.`AZ_Code` != p2.`AZ_Code`)
group by p1.Model_Number

查询2

SELECT AZ_Code, Model_Number
FROM dumpdata
WHERE Model_Number IN (
    SELECT Model_Number
    FROM Dumpdata
    GROUP BY Model_number
    HAVING COUNT(id) > 1
)

Answer 1

要获取重复型号，您可以使用计数＆gt; 1

SELECT Model_Number
FROM dumpdata
group by model_number
having count(*) > 1