怎么合并表

怎么做成一张??                                                                            
[解决办法]

select MONTH(a.SummaryDate) as Date,
SUM(a.RevenueMoney) as AllMoney 
FROM (select summarydate,revenueMoney from dbo.Summary
WHERE YEAR(a.SummaryDate)='2012' and 
a.SId = '001' union all
select summarydate,revenueMoney from dbo.summary_1  
WHERE YEAR(a.SummaryDate)='2012' and 
a.SId = '001' union all
select summarydate,revenueMoney from dbo.summary_2  
WHERE YEAR(a.SummaryDate)='2012' and 
a.SId = '001')
AS a 
GROUP BY 
MONTH (a.SummaryDate)
order by (Date) desc

不知道你是不要这样的结果