Question

我有查询，工作正常：

select t1.[Fiscal Year],
t1.[Level1], t1.[Level2], t1.[colE],t1.[colF],
t1.Value,t2.Value [previous_value]
from  
(  select [Fiscal Year],[Level1],[Level2],[colE],[colF],sum([CA Service Bookings Net]) value
  from [table1] 
  group by [Fiscal Year],[Level1],[Level2],[colE],[colF]
)t1
left JOIN
(  
select [Fiscal Year],[Level1],[Level2],[colE],[colF],sum([CA Service Bookings Net]) value
  from [table1] 
  group by [Fiscal Year],[Level1],[Level2],[colE],[colF]
)t2
ON t1.[Fiscal Year] = t2.[Fiscal Year]+1 and
t1.[Level1] = t2.[Level1] and
t1.[Level2] = t2.[Level2] and
t1.[colE] = t2.[colE] and
t1.[colF] = t2.[colF]

当我想添加更多列（colE，colF，colG ...）时，它没问题。

但是当我尝试添加列时： [QuarterID] 包含的值为：2015Q1,2015Q2,2015Q3,2015Q4,2016Q1 ......

t2.Value [previous_value]返回空值。你知道什么是理由吗？

这是带有[QuarterID]的代码：

select t1.[Fiscal Year],t1.[QuarterID],
t1.[Level1], t1.[Level2], t1.[colE],t1.[colF],
t1.Value,t2.Value [previous_value]
from  
(  select [Fiscal Year],[QuarterID],[Level1],[Level2],[colE],[colF],sum([CA Service Bookings Net]) value
  from [table1] 
  group by [Fiscal Year],[QuarterID][Level1],[Level2],[colE],[colF]
)t1
left JOIN
(  
select [Fiscal Year],[QuarterID],[Level1],[Level2],[colE],[colF],sum([CA Service Bookings Net]) value
  from [table1] 
  group by [Fiscal Year],[QuarterID],[Level1],[Level2],[colE],[colF]
)t2
ON t1.[Fiscal Year] = t2.[Fiscal Year]+1 and
t1.[Level1] = t2.[Level1] and
t1.[Level2] = t2.[Level2] and
t1.[colE] = t2.[colE] and
t1.[colF] = t2.[colF] and
t1.[QuarterID] = t2.[QuarterID]

Answer 1

我能想象你得到NULLS的唯一方法就是你要么没有正确地将QuarterID添加到t1＆amp;的JOIN条件中。 t2，或者如果您希望在t2中找到QuarterID，但是那里没有。

您是否加入t1中的2015Q1将加入t2中的2014Q1？并且所有必需的quarterID都存在吗？

Answer 2

刚做完并且工作得很完美：

t1.[Fiscal Quarter ID] = cast((cast(left(t2.[Fiscal Quarter ID],4) as numeric) +1) as varchar)+right(t2.[Fiscal Quarter ID],2)

上一季度的季度值

2 个答案: