Question

我需要填写数据中缺少的时间间隔，并为任何间隙填充Cnt列为0。我是否需要使用日历表？

我的查询结果已经汇总，我只需要添加空白。

select name 
       ,YR 
       ,MO 
       ,[Cnt]
from dbo.OON

当前输出：

Name | YR | MO | Cnt
Kelly | 2014 | 1 | 197
Kelly | 2014 | 3 | 200
Kelly | 2014 | 5 | 300
Kelly | 2015 | 2 | 100
Kelly | 2015 | 3 | 50
Kelly | 2015 | 6 | 70

期望的输出：

Name | YR | MO | Cnt
Kelly | 2014 | 1 | 197
Kelly | 2014 | 2 | 0
Kelly | 2014 | 3 | 200
Kelly | 2014 | 4 | 0
Kelly | 2014 | 5 | 300
Kelly | 2014 | 6 | 0
Kelly | 2014 | 7 | 0
Kelly | 2014 | 8 | 0
Kelly | 2014 | 9 | 0
Kelly | 2014 | 10 | 0
Kelly | 2014 | 11 | 0
Kelly | 2014 | 12 | 0
Kelly | 2015 | 1 | 0
Kelly | 2015 | 2 | 100
Kelly | 2015 | 3 | 50
Kelly | 2015 | 4 | 0
Kelly | 2015 | 5 | 0
Kelly | 2015 | 6 | 70
Kelly | 2015 | 7 | 0
Kelly | 2015 | 8 | 0
Kelly | 2015 | 9 | 0
Kelly | 2015 | 10 | 0
Kelly | 2015 | 11 | 0
Kelly | 2015 | 12 | 0

Answer 1

另一个选项是ad-hoc计数表

Declare @OON table (Name varchar(25),YR int,MO int,Cnt int)
Insert Into @OON values
('Kelly' , 2014 , 1 , 197),
('Kelly' , 2014 , 3 , 200),
('Kelly' , 2014 , 5 , 300),
('Kelly' , 2015 , 2 , 100),
('Kelly' , 2015 , 3 , 50),
('Kelly' , 2015 , 6 , 70)

Declare @PerBeg date = '2014-01-01'
Declare @Months int  = 24

Select B.Name
      ,Yr=Year(A.D)
      ,MO=Month(A.D) 
      ,Cnt=IsNull(C.Cnt,0)
 From (Select Top (@Months) D=DateAdd(MM,-1+Row_Number() Over (Order By (Select null)),@PerBeg) From  master..spt_values) A
 Cross Join (Select Distinct Name from @OON) B
 Left  Join @OON C on B.Name=C.Name and Year(A.D)=C.Yr and Month(A.D)=C.MO

返回

Name    Yr      MO  Cnt
Kelly   2014    1   197
Kelly   2014    2   0
Kelly   2014    3   200
Kelly   2014    4   0
Kelly   2014    5   300
Kelly   2014    6   0
Kelly   2014    7   0
Kelly   2014    8   0
Kelly   2014    9   0
Kelly   2014    10  0
Kelly   2014    11  0
Kelly   2014    12  0
Kelly   2015    1   0
Kelly   2015    2   100
Kelly   2015    3   50
Kelly   2015    4   0
Kelly   2015    5   0
Kelly   2015    6   70
Kelly   2015    7   0
Kelly   2015    8   0
Kelly   2015    9   0
Kelly   2015    10  0
Kelly   2015    11  0
Kelly   2015    12  0

Answer 2

你可以有一个永久的日历表，或者你可以使用普通的Numbers表逃脱。无论哪种方式，建立递归cte是更优选的解决方案。但是，如果它是一次性报告，您可以轻松地使用简单的CTE，如下所示：

;with n as (
  select 1 as n
  UNION ALL
  SELECT n + 1 FROM n WHERE n < 20),
years as (
  select 2013 + n.n as [year] from n where n < 3),
months as (
  select 0 + n.n as [month] from n where n < 13)
select r.name, years.[year], months.[month], coalesce(r.Cnt,0)
from years cross join months
left join dbo.OON r on years.[year] = r.[YR] and months.[month] = r.[MO]
order by 1,2,3

在上面的查询中，您可能希望使用years cte的初始值和年份数作为参数

问：TSQL - 在数据中添加缺少的年和月缺口？

2 个答案: