假设一个表中有1000条记录的多列，如何在整个表中找到重复记录？

Question

假设一个表中有1000条记录的多列，如何在整个表中找到重复记录？

请帮忙。

Answer 1

重复的ID：

select s.id, t.* 
from [stuff] s
join (
    select name, city, count(*) as qty
    from [stuff]
    group by name, city
    having count(*) > 1
) t on s.name = t.name and s.city = t.city     

答案也发布在此主题中：How do I find duplicates across multiple columns?