求一条SQL语句，谢谢哈

求一条SQL语句，多谢哈
有一个表是Notice
格式如下：

HTML code

GRP    PR_GI        refseq1    9625921        NC_0013481    9625992        NC_0013501    9628039        NC_0016501    52139285    NC_0062731    52139329    NC_0062731    13095591    NC_0026652    9625922        NC_0013482    9625993        NC_0013502    9628040        NC_0016502    9628075        NC_0016502    9629392        NC_001806

HTML code

GRP    PR_GI        refseq1    52139285    NC_0062731    52139329    NC_0062732    9628040        NC_0016502    9628075        NC_001650

SQL code

select *from Notice awhere exists (select 1 from Notice where GRP=a.GRP and refseq=a.refseq and PR_GI<>a.PR_GI)
[解决办法]
select a.* from tt a  
inner join  
(select GRP,refseq from tt group by GRP,refseq having count(*)>=2) b  
on a.refseq=v.refseq and a.GRP=b.GRP
[解决办法]
select GRP,PR_GI,refseq from (
SELECT A.*,
(SELECT COUNT(*) FROM Notice A WHERE A.GRP=B.GRP AND A.refseq=B.refseq) AS num
  FROM Notice  B) where c.num>1