SqlServer查询重复数据
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
转自:SqlServer查询重复数据