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Write a TSQL to generate a date for a BI date table

Posted on 2014-10-30
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Last Modified: 2014-11-04
How to run a TSQL to generate the following records for a particular year ?

YEAR      FISALPERIOD   PERIOD      QUARTER      MONTH          WEEKNO      DATE
2014      8                        11                      2014/Q3              2014/11          45               2014-11-05 00:00:00.000
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Question by:AXISHK
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5 Comments
 
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Expert Comment

by:Christopher Gordon
ID: 40413081
One record per week?  per day?
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Christopher Gordon earned 350 total points
ID: 40413094
If it's daily, something like this would work (I'm assuming your fiscal period occurs three months before calendar period):

declare @i int = 1
declare @currentDate date = '1/1/2014'

declare @time_dim table (calendarYear int, fiscalPeriod int, calendarPeriod int, calendarQuarter varchar(10), calendarMonth varchar(10), weekno int, calendarDate datetime)

while @i <= 365
begin

	insert into @time_dim (calendarYear, fiscalPeriod, calendarPeriod, calendarQuarter, calendarMonth, weekno, calendarDate)
	
	values (
			YEAR(@currentDate)
		,	Month(DATEADD(m, -3, @currentDate))
		,	MONTH(@currentDate)
		,	cast(year(@currentDate) as char(4)) + '/Q' + cast(DATEPART(quarter, @currentDate) as CHAR(1))
		,	cast(year(@currentDate) as char(4)) + '/' + cast(DATEPART(month, @currentDate) as CHAR(2))
		,	DATEPART(week, @currentDate), @currentDate)

	set @i = @i + 1
	
	set @currentDate = dateadd(day, 1, @currentDate)

end

select * from @time_dim

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Assisted Solution

by:Jim Horn
Jim Horn earned 150 total points
ID: 40413170
Looks like you're getting an answer above, but just to throw it out here's an article on Build your own calendar table to perform complex date expressions with source code that pulls this off by day.  Scroll down to 'Now we're done modifying the table, which will look like this ' and you'll see how it looks similar to what you're asking.
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Author Comment

by:AXISHK
ID: 40421128
Not correct, The record should be like the value below,


YEAR      PERIOD      QUARTER      MONTH      WEEKNO            DATE_IDX
2014      1               2014/Q4              2015/01      1                    2015-01-01 00:00:00.000
2014      4               2014/Q1              2014/04      14                    2014-04-01 00:00:00.000
2014      12               2014/Q3        2014/12      53                    2014-12-31 00:00:00.000
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Expert Comment

by:Christopher Gordon
ID: 40423047
I added a dateadd(m, -3, @currentDate) in the part of the code that calculates the quarter field

declare @i int = 1
declare @currentDate date = '1/1/2014'

declare @time_dim table (calendarYear int, fiscalPeriod int, calendarPeriod int, calendarQuarter varchar(10), calendarMonth varchar(10), weekno int, calendarDate datetime)

while @i <= 365
begin

	insert into @time_dim (calendarYear, fiscalPeriod, calendarPeriod, calendarQuarter, calendarMonth, weekno, calendarDate)
	
	values (
			YEAR(@currentDate) --calendar year 
		,	Month(DATEADD(m, -3, @currentDate)) -- fiscal period
		,	MONTH(@currentDate) -- calendar period
		,	cast(year(DATEADD(m, -3, @currentDate)) as char(4)) + '/Q' + cast(DATEPART(quarter, DATEADD(m, -3, @currentDate)) as CHAR(1)) -- 
		,	cast(year(@currentDate) as char(4)) + '/' + cast(DATEPART(month, @currentDate) as CHAR(2))
		,	DATEPART(week, @currentDate), @currentDate)

	set @i = @i + 1
	
	set @currentDate = dateadd(day, 1, @currentDate)

end


select * from @time_dim

                                          

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