T-SQL：第一行的CTE row_number over（）错误结果

Question

我有以下的Calendar表起始于2014-01-01 。

CREATE TABLE [dbo].[TO_BDB_NOSSCE_ISO_CALENDAR](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [DATE] [date] NOT NULL,
    [YEAR]  AS (datepart(year,[DATE])) PERSISTED,
    [SEMESTER]  AS (case when datepart(month,[DATE])<(7) then '1' else '2' end) PERSISTED NOT NULL,
    [TRIMESTER]  AS (case when datepart(month,[DATE])<(4) then '1' else case when datepart(month,[DATE])<(7) then '2' else case when datepart(month,[DATE])<(10) then '3' else '4' end end end) PERSISTED NOT NULL,
    [MONTH]  AS (case when len(CONVERT([varchar](2),datepart(month,[DATE]),(0)))=(1) then '0'+CONVERT([varchar](2),datepart(month,[DATE]),(0)) else CONVERT([varchar](2),datepart(month,[DATE]),(0)) end) PERSISTED,
    [WEEK]  AS (case when len(CONVERT([varchar](2),datepart(iso_week,[DATE]),(0)))=(1) then '0'+CONVERT([varchar](2),datepart(iso_week,[DATE]),(0)) else CONVERT([varchar](2),datepart(iso_week,[DATE]),(0)) end),
    [DAY]  AS (case when len(CONVERT([varchar](2),datepart(day,[DATE]),(0)))=(1) then '0'+CONVERT([varchar](2),datepart(day,[DATE]),(0)) else CONVERT([varchar](2),datepart(day,[DATE]),(0)) end) PERSISTED,
    [WEEKNUMBER]  AS (datepart(iso_week,[DATE])),
PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

我创建了一个存储过程，并将2014-01-01添加到2020-12-31 。

PROCEDURE [dbo].[sp_INSERT_CALENDAR_DAYS_INVERVAL]

      @Increment              CHAR(1),
      @StartDate              DATETIME,
      @EndDate                DATETIME

AS 
BEGIN    
WITH cteRange (DateRange) AS (
            SELECT @StartDate
            UNION ALL
            SELECT 
                  CASE
                        WHEN @Increment = 'd' THEN DATEADD(dd, 1, DateRange)
                        WHEN @Increment = 'w' THEN DATEADD(ww, 1, DateRange)
                        WHEN @Increment = 'm' THEN DATEADD(mm, 1, DateRange)
                  END
            FROM cteRange
            WHERE DateRange <= 
                  CASE
                        WHEN @Increment = 'd' THEN DATEADD(dd, -1, @EndDate)
                        WHEN @Increment = 'w' THEN DATEADD(ww, -1, @EndDate)
                        WHEN @Increment = 'm' THEN DATEADD(mm, -1, @EndDate)
                  END)

      INSERT INTO [TO_BDB].[dbo].[TO_BDB_NOSSCE_ISO_CALENDAR] ([DATE])
      SELECT DateRange
      FROM cteRange

然后，我想按照以下逻辑检索绝对周编号：当前周-1（上周），是零周（0），我想往后看12周，再往前看6周。

with absolute_weeks as (
  select distinct YEAR, WEEK
from [TO_BDB].[dbo].[TO_BDB_NOSSCE_ISO_CALENDAR]
where DATEADD(week, 0, DATE) between cast(DATEADD(WEEK, -12, GETDATE())  as date) 
                   and cast(DATEADD(WEEK, +6, GETDATE())  as date) 
)
select *, (row_number() over (order by YEAR, WEEK) - 13) as relative_week
from absolute_weeks 
order by YEAR, WEEK;

我得到以下结果，第-11周到+6周是正确的，但是由于某些原因，第-12周是不正确的。 您能否解释为什么以及如何解决？

YEAR WEEK relative_week
----------------------
2014    01  -12
2014    43  -11
2014    44  -10
2014    45  -9
2014    46  -8
2014    47  -7
2014    48  -6
2014    49  -5
2014    50  -4
2014    51  -3
2014    52  -2
2015    01  -1
2015    02  0
2015    03  1
2015    04  2
2015    05  3
2015    06  4
2015    07  5
2015    08  6

Answer 1

我认为问题在于

DATEPART(ISO_WEEK, '20141231');

实际上返回1正确，但会弄乱您的数据。

您可以在基表中使用“ ISO_Week的年份”的单独字段，如下所示：
ISOWEEKYEAR = YEAR(d) + CASE WHEN DATEPART(ISO_WEEK, d) = 1 AND MONTH(d) = 12 THEN 1 ELSE 0 END

Answer 2

正如@KekuSemau指出的，问题在于2014年12月31日的ISOWEEK为1。例如，您可以通过在DATE或YEAR，WEEK进行订购来解决此问题；

select year,week,(row_number() over (order by min([DATE])) - 13) as relative_week
from [dbo].[TO_BDB_NOSSCE_ISO_CALENDAR]
where [DATE] between DATEADD(WEEK, -12, GETDATE()) and DATEADD(WEEK, +6, GETDATE()) 
group by year,week
order by min([DATE])

您可能需要在“今天”在一周的开始和结束时进行测试，以确保行为符合您的目的。

顺便说一句-正确地提出问题，工作代码，明确问题等的荣誉-似乎没有很多类似的东西:)

EDIT1

这是一种完全不同的有效方法（我认为:)

;with cteNumbers as (select top 20 row_number() over (order by object_id) -13 as rn from sys.objects)
select c.year,c.week,n.rn
from cteNumbers n
join [dbo].[TO_BDB_NOSSCE_ISO_CALENDAR] c on c.date = cast(dateadd(d, n.rn*7, getdate()) as date)

您仍然需要对其进行测试，以确保它在一周的开始和结束时都能正常运行。

希望这可以帮助，

里斯