Sql server 2005 在另一个查询中通过新创建的计算列

下面我有两个单独的查询，它们运行正常。现在我创建了一个计算列，以提供YMs的工作日计数，并希望将其传递到query1（连接将是query1.Period=query2.YMs） 请参见下面的查询和输出

SELECT        Client, ClientGroup, Type, Value, Period, PeriodName, PeriodNumber, ClientName
FROM            metrics.dbo.vw_KPI_001_Invoice 



select YMs,sum(case when IsWorkDay = 'X' then 1 else 0 end) from IESAONLINE.Dbo.DS_Dates
where Year > '2013'
group by YMs 

Query 1
Client  ClientGroup Type    Value   Period  PeriodName        PeriodNumber   ClientName
0LG0    KarroFoods  Stock   5691.68 201506  Week 06 2015    35  Karro Foods Scunthorpe

Query 2
YMs (No column name)
201401  23

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将开展以下工作：

SELECT Client, ClientGroup, Type, Value, Period, PeriodName, PeriodNumber, ClientName, cnt
FROM            metrics.dbo.vw_KPI_001_Invoice q1
INNER JOIN (select YMs,sum(case when IsWorkDay = 'X' then 1 else 0 end) as cnt from IESAONLINE.Dbo.DS_Dates
where Year > '2013'
group by YMs ) q2 ON q1.Period = q2.YMs

如果一个值不总是可用的，那么您可以考虑将内部连接更改为外部连接。