SQL Server 查询数据重复
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