通过在另一个查询中新创建的计算列

Question

我有两个单独的查询，下面哪些运行正确。现在，我创建了一个计算列以提供YM工作日的计数，并希望将这通过query1（加入将是query1.Period = query2.Yms） 请参阅下面的查询和输出。

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 

Answer 1

请问以下工作：

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 

如果值并不总是可用的，那么你可能会考虑改变INNER JOIN到外连接。