带有计数错误的sql子查询

我有以下疑问

select   Obj.regcode,count(*) 
FROM     dbo.Objecten Obj          
INNER JOIN dbo.Dossiers Dos ON obj.objectnr=Dos.objectnr  
WHERE Dos.plan_gereed between '2014-01-01' and '2014-02-01'  
group by obj.regcode having count(*) > 1

工作正常，它将相加并仅显示具有多个regcode的

现在我想再次将它们拆分，这样我就可以查看哪些档案与regcode相结合。我需要先对它们进行分组，然后才能确定在定义的期间内多次使用了哪些regcode

所以我想我的问题是这样的：

SELECT   obj.regcode, Dos.dossiernr  
FROM     dbo.objecten obj, 
         dbo.Dossiers Dos  
WHERE    obj.regcode IN ( select   Obj.regcode,count(*) 
                          FROM     dbo.Objecten Obj          
                           INNER JOIN  dbo.Dossiers Dos ON obj.objectnr=Dos.objectnr  
                          WHERE Dos.plan_gereed between '2014-01-01' and '2014-02-01'  
                          group by obj.regcode 
                          having count(*) > 1 )  
AND      obj.objectnr=Dos.objectnr

但这一条给出了以下错误：

选择时，只能在选择列表中指定一个表达式 子查询不随EXISTS一起引入

有人能帮我吗

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提前感谢

只需从in select复选框中删除count*

SELECT obj.regcode, Dos.dossiernr FROM dbo.objecten obj, dbo.Dossiers Dos WHERE obj.regcode IN ( select Obj.regcode FROM dbo.Objecten Obj INNER JOIN dbo.Dossiers Dos ON obj.objectnr=Dos.objectnr WHERE
Dos.plan_gereed between '2014-01-01' and '2014-02-01' group by obj.regcode having count(*) > 1 ) AND obj.objectnr=Dos.objectnr