在SQL中选择空周

Question

我在几周内使用SQL中的DATEPART进行分组.但是,我想要包括空周,不仅仅包括数周.我有一个脚本可以完美地收集数周的数据,但不是空的周.我一直试图使用左外连接,但我的SQL技能并不是那么好.我决定问你们.

这是我的脚本:

select 
    DatePart(Year, MYTABLE.CREATION_DATE) as DateYear,
    DatePart(Month, MYTABLE.CREATION_DATE) as DateMonth,
    DatePart(Week, MYTABLE.CREATION_DATE) as DateWeek,
    sum(cast(MYTABLE.BASE_TRANSACTION_VALUE as int)) as Value,
    min(MYTABLE.CREATION_DATE) as DateT
from MYTABLE
where MYTABLE.SEGMENT2 like '00601'
    and MYTABLE.SEGMENT4 like '%'
    and MYTABLE.CREATION_DATE > '2012-12-30 12:00:00'
    and MYTABLE.CREATION_DATE < '2013-12-30 11:00:00'
group by 
    DatePart(Year, MYTABLE.CREATION_DATE), 
    DatePart(Month, MYTABLE.CREATION_DATE), 
    DatePart(Week, MYTABLE.CREATION_DATE)
order by DateYear, DateMonth, DateWeek

这是该脚本的结果.

在这种情况下,你们可以给我一个加入条款的例子吗？

Answer 1

[更新时间:2014-01-09 08:06 UTC]

您可以动态创建日期(DateRange),并将它们外部连接到您的选择,如下所示:

declare @startdate date;
set @startdate = '2012-12-30';
declare @enddate date;
set @enddate = '2013-12-30'

;with DateRange AS
(
    SELECT 
        DatePart(Year, @startdate) as DateYear,
        DatePart(Month, @startdate) as DateMonth,
        DatePart(iso_Week, @startdate) as DateWeek,
        @startdate as DateValue
    UNION ALL
    SELECT 
        DatePart(Year, dateadd(dd,7,DateValue)) as DateYear,
        DatePart(Month, dateadd(dd,7,DateValue)) as DateMonth,
        DatePart(iso_Week, dateadd(dd,7,DateValue)) as DateWeek,
        dateadd(dd,7,DateValue)
    FROM   DateRange
    WHERE  dateadd(dd,7,DateValue) <= @enddate
), data as (
    select 
        DatePart(Year, MYTABLE.CREATION_DATE) as DateYear,
        DatePart(Month, MYTABLE.CREATION_DATE) as DateMonth,
        DatePart(iso_Week, MYTABLE.CREATION_DATE) as DateWeek,
        sum(cast(MYTABLE.BASE_TRANSACTION_VALUE as int)) as Value,
        min(MYTABLE.CREATION_DATE) as DateT
    from MYTABLE
    where MYTABLE.SEGMENT2 like '00601'
        and MYTABLE.SEGMENT4 like '%'
        and MYTABLE.CREATION_DATE > '2012-12-30 12:00:00'
        and MYTABLE.CREATION_DATE < '2013-12-30 11:00:00'
    group by 
        DatePart(Year, MYTABLE.CREATION_DATE),
        DatePart(Month, MYTABLE.CREATION_DATE),
        DatePart(iso_Week, MYTABLE.CREATION_DATE)
)
select 
    DateRange.DateYear,
    DateRange.DateMonth,
    DateRange.DateWeek,
    data.Value,
    data.DateT
from data
right outer join
DateRange 
on 
    data.DateYear = DateRange.DateYear
and data.DateWeek = DateRange.DateWeek
order by 
    DateRange.DateYear, 
    DateRange.DateMonth, 
    DateRange.DateWeek