SQL Server查询重复数据

1.查询单列重复(table：表名，name 字段名)：

select * from table

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

2.查询多列重复(table：表名，name 字段名，code字段名)：

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