SqlServer查詢重復數據

1.查詢單列重復：

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

2.查詢多列重復：

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