sql查询不重复 - MS-SQL Server / 疑难问题

regInfo 注册表
MemberId regDate
10001 2010-5-1
10002 2010-5-2
10003 2010-5-3
10004 2010-5-4
10005 2010-5-5
UserRecord 充值记录表
MemberId money dates
10001 5.00 2010-5-5
10002 10.00 2010-5-5
10001 15.00 2010-5-6
10003 5.00 2010-5-6
10001 10.00 2010-5-7 
10004 20.00 2010-5-7
查询当月 注册的会员充值10元以上的记录。只保留第一条充值金额大于10的记录 要求显示结果
10001 15.00 2010-5-6
10002 10.00 2010-5-5
10004 20.00 2010-5-7  
这个怎么写啊

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SQL code:
select t.* from UserRecord t , MemberId n where t.MemberId = n.MemberId and datediff(mm,n.regDate,getdate()) = 0 and t.money > 10 and t.money = (select top 1 money from UserRecord where money > 10 and MemberId = t.MemberId)

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SQL code:
[del]select b.MemberId,max(A.money),min(dates) as FirstDay as MonthMoney from UserRecord a inner join regInfo b on a.MemberId=b.MemberId
where month(a.dates)=month(getdate()) group by a.MemberId
having max(A.money)>10[/del]

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SQL code

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