我有这个视图,它有一个名为WeekNr的特定的相对周编号列。源表中的两列(WeekNr和CURWEEK)使用通常的日历周编号保存:1,2,3 ...到52.
此视图用于Excel文件,并且企业希望查看从-12到+6的相对周编号:过去12周和6周预测,相对于第0周,即当前周(今天,2015年1月13日,这是日历周2)。
所以,这段代码工作得很好,直到一年之久。在52之后,WeekNr - CURWEEK不再像希望的那样工作了。
你有什么优雅的解决方案吗?
CREATE VIEW [dbo].[vw_NOSSCE_HealthKPIs_DEV]
AS
(
SELECT
[Region]
,[Country]
,[GlobalMaterialCode]
,[Material]
,[MaterialCode]
,[PlantCode]
,[Plant]
,[Brand]
,
(WeekNr - (SELECT TOP 1 CURWEEK FROM [TO_BDB].[dbo].[TO_BDB_NOSSCE_FACT_NORMALIZED]) ) as
WeekNr
,[MEDICAL_NEED]
,[TOP_SELLER]
,[PHARMABU_CODE]
,[PharmaBU]
,[SourceLocationCode]
,[SourceLocation]
,[InventoryTotal]
,[MaxStockQtyTotal]
,[TotalSafetyStockTotal]
,[DangerTreshold]
,[FORECAST_FLG]
,[DangerZoneDesc]
FROM [TO_BDB].[dbo].[TO_BDB_NOSSCE_PAST12_HIST]
WHERE (WeekNr - (SELECT TOP 1 CURWEEK
FROM [TO_BDB].[dbo].[TO_BDB_NOSSCE_FACT_NORMALIZED]) )
BETWEEN -12 and 6
GROUP BY [Region]
,[Country]
,[GlobalMaterialCode]
,[Material]
,[MaterialCode]
,[PlantCode]
,[Plant]
,[Brand]
,WeekNr, [MEDICAL_NEED]
,[TOP_SELLER]
,[PHARMABU_CODE]
,[PharmaBU]
,[SourceLocationCode]
,[SourceLocation]
,[InventoryTotal]
,[MaxStockQtyTotal]
,[TotalSafetyStockTotal]
,[DangerTreshold]
,[FORECAST_FLG]
,[DangerZoneDesc]
UNION ALL
SELECT * FROM [dbo].[vw_NOSSCE_HealthKPIs] WHERE WeekNr > 0
)
更新,我创建了日历表,为什么它会给我一周53?
CREATE TABLE [dbo].[TO_BDB_NOSSCE_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(week,[DATE]),0))=(1) then '0'+CONVERT([varchar](2),datepart(week,[DATE]),0) else CONVERT([varchar](2),datepart(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(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
SET ANSI_PADDING OFF
GO
答案 0 :(得分:2)
首先,如果您使用代码生成Excel文件,那么使用Excel公式而不是使用SQL进行相对编号可能会更好。
其次,周数不能识别周数。要识别一周,您需要年份和周数,或者您需要一个日期。这意味着除了本周之外,您可能还需要更改表来存储年份。
这里我们使用日历表来简化这样的查询。最小的简化日历表可能如下所示。我们使用ISO年和周,但不要让你感到困惑。您可以使用任何类型的编号。 (为PostgreSQL编写,但SQL Server的原理是相同的。)
create table calendar (
cal_date date primary key,
iso_year integer not null,
iso_week integer not null
);
create index on calendar (iso_year, iso_week);
我们使用检查约束(未显示)来保证iso_year和iso_week的值对于cal_date的每个值都是正确的。很少(高度信任)的人有权插入和删除行。
在标准SQL中,我可能会写这样的东西来获得我们感兴趣的绝对周。
select distinct iso_year, iso_week
from calendar
where cal_date between cast(current_date - interval '12 weeks' as date)
and cast(current_date + interval '6 weeks' as date)
order by iso_year, iso_week;
iso_year iso_week 2014 43 2014 44 2014 45 ... 2015 7 2015 8 2015 9
它返回19行,这似乎是您的案例的正确数字。 (注意我自己的错误。)将它放入公共表表达式或视图中,您可以使用简单的算术对相对周数进行编号。 (我使用过CTE,所以这个答案或多或少都是独立的。)
with absolute_weeks as (
select distinct iso_year, iso_week
from calendar
where cal_date between cast(current_date - interval '12 weeks' as date)
and cast(current_date + interval '6 weeks' as date)
)
select *, (row_number() over (order by iso_year, iso_week) - 13) as relative_week
from absolute_weeks
order by iso_year, iso_week;
iso_year iso_week relative_week -- 2014 43 -12 2014 44 -11 2014 45 -10 ... 2015 7 4 2015 8 5 2015 9 6
如果您的数据包含年份和星期,您可以在iso_year和iso_week上加入您的查询。如果您的数据具有日期,则可以将上一个查询移动到CTE或视图中,然后加入日历表以获取每周的日期。
with absolute_weeks as (
select distinct iso_year, iso_week
from calendar
where cal_date between cast(current_date - interval '12 weeks' as date)
and cast(current_date + interval '6 weeks' as date)
), relative_weeks as (
select *, (row_number() over (order by iso_year, iso_week) - 13) as relative_week
from absolute_weeks
)
select c.cal_date, c.iso_year, c.iso_week, r.relative_week
from calendar c
inner join relative_weeks r on c.iso_year = r.iso_year and c.iso_week = r.iso_week
order by c.cal_date;
cal_date iso_year iso_week relative_week -- 2014-10-20 2014 43 -12 2014-10-21 2014 43 -12 2014-10-22 2014 43 -12 ... 2015-01-12 2015 3 0 2015-01-13 2015 3 0 2015-01-14 2015 3 0 ... 2015-02-27 2015 9 6 2015-02-28 2015 9 6 2015-03-01 2015 9 6
本周 - 2015-01-13周 - 是ISO第3周,而不是第2周,因为您为它们编号。你自己的日历表应该反映你自己的逻辑,而不是我的。
此查询返回133行,这似乎是正确的数字。每个ISO周有七天,因此7 * 19行是基于ISO周的日历表的正确数字。您自己的要求可能会偶尔为您提供一个具有不同天数的周。