SQL Server查询重复数据

1.查询单列重复

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

2.查询多列重复

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