SqlServer教程

SQL Server查询重复数据

本文主要是介绍SQL Server查询重复数据,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!

1.查询单列重复:

select * from test
where name in (select name from test group by name having count
(name) > 1)

2.查询多列重复

SELECT a.* FROM test a,(
SELECT name,code
FROM test
GROUP BY name,code
HAVING COUNT(1)>1
) AS b
WHERE a.name=b.name AND a.code=b.code

 

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