在SQL中選擇空白周

Question

我在SQL中使用DATEPART按周分組。不過，我想包括空的周，不僅包括價值周。我有一個腳本，可以在幾周內完美地收集數據，但不是空的周。我一直在嘗試使用左外連接，但是我的SQL技能並不是那麼棒。我決定問你們。

這裏是我的腳本：

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 

這是腳本的結果。

難道你們可能給我一個連接語句可能看起來像在這種情況下的一個例子嗎？

Answer 1

這應該這樣做。我的SQLFiddle是http://www.sqlfiddle.com/#!6/b777f/1/0

declare @WeekTable table(
    [WeekDate] datetime 
) 
declare @startDate datetime, 
@EndDate datetime 
select @startDate = '1/1/2013',@EndDate = '12/31/2013' 
while @startDate<=@EndDate begin 
    insert into @WeekTable values(@startDate) 
    set @startDate = @startDate+7 
end 

select 
    DatePart(Year, [WeekDate]) as DateYear, 
    DatePart(Month, [WeekDate]) as DateMonth, 
    DatePart(Week, [WeekDate]) as DateWeek, 
    sum(cast(MYTABLE.BASE_TRANSACTION_VALUE as int)) as Value, 
    min(isnull(MYTABLE.CREATION_DATE,[WeekDate])) as DateT 
from 
    @WeekTable 
    left outer join 
    MYTABLE 
    on 
    DatePart(Week,MYTABLE.CREATION_DATE) =DatePart(Week, [WeekDate]) 
    and 
    DatePart(Year,MYTABLE.CREATION_DATE) =DatePart(Year, [WeekDate]) 
    and 
    MYTABLE.SEGMENT2 like '00601' 
    and 
    MYTABLE.SEGMENT4 like '%' 
group by 
    DatePart(Year, [WeekDate]) , 
    DatePart(Month, [WeekDate]), 
    DatePart(Week, [WeekDate]) 
order by 
    DateYear, DateMonth, DateWeek 

Answer 2

[更新2014年1月9日08:06 UTC]

您可以創建動態的日期（日期範圍）和外連接到您的選擇是這樣的：

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