查找所有重复项或更多项的最佳方法是什么？

Question

我需要编写一个查询，该查询将查找具有2个或更多相同名称的所有行。我写的如下：

SELECT name 
FROM (
      SELECT name, COUNT(*) as count 
      FROM partner.propertie 
      GROUP BY name) as t 
WHERE t.count > 1;

但我不确定这是否是最佳方式。我有很大的桌子......

Answer 1

HAVING就是你想要的：

SELECT name 
FROM partner.propertie 
GROUP BY name
HAVING COUNT(*) > 1

Answer 2

你可以试试这个：

select * from (
  SELECT name,
  ROW_NUMBER() OVER(PARTITION BY name ORDER BY name asc) AS Row
  FROM partner.propertie 
) dups
where 
dups.Row > 1

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