Thursday, March 01, 2012

SQL 2008 script to populate Data dimension table (revised)

Purpose
For a business app (not a datawarehouse) I can use the date dimension table too. But I prefer not to work with a primarey key that is an autoincrement value, as I will be using it in time registration tables, that can benefit from showing a date value and not an autoincrement ID that is nondescriptive. I will be using the data table as a lookup table for entering date on specific dates, i.e. not weekends and for me it sounded easier to create a table for this than to create code for date rules in the business tier. This way a user with sufficient permission has the added flexibility to make a data available e.g. on weekend, that would otherwise be declared as a rule in code.
Finally the DATE type in SQL 2008 is not taking up a lot of space either.
Also I have clarified the naming of my columns, instead of having a column Quarter or Month, it is now called QuarterOfYear and MonthOfYear. This indicates better what the content is and the names don't conflict with sql server functions, thereby avoiding having to type square brackets around the names [Month].
Create the table statement
CREATE TABLE [dbo].[DateDim](

[ActualDate] [date] NOT NULL,
[ActualYear] [int] NOT NULL,
[QuarterOfYear] [int] NOT NULL,
[MonthOfYear] [int] NOT NULL,
[WeekOfYear] [int] NOT NULL,
[DayOfYear] [smallint] NOT NULL,
[DayOfMonth] [smallint] NOT NULL,
[DayOfWeek] [smallint] NOT NULL,
[IsWeekend] [bit] NOT NULL,
[IsHoliday] [bit] NOT NULL,
[CalendarWeek] [smallint] NOT NULL,
[BusinessYearWeek] [smallint] NOT NULL,
[LeapYear] [bit] NOT NULL,
CONSTRAINT [PK_DateDim] PRIMARY KEY CLUSTERED
(
[ActualDate] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
Stored procedure to populate the table
CREATE PROCEDURE [dbo].[sp_createTimeDim] AS
--declare variables

DECLARE @DT DATE
DECLARE @YEAR INT
DECLARE @QUARTER INT
DECLARE @MONTH INT
DECLARE @WEEK INT
DECLARE @DayofYear INT
DECLARE @DayofMonth INT
DECLARE @DayofWeek INT
DECLARE @IsWeekend BIT
DECLARE @IsHoliday BIT
DECLARE @CalendarWeek INT
DECLARE @DayName VARCHAR(20)
DECLARE @MonthName VARCHAR(20)
DECLARE @BusinessYearWeek INT
DECLARE @LeapYear BIT

--initialize variables
SELECT @BusinessYearWeek =0
SELECT @CalendarWeek = 1
SELECT @LeapYear =0

--the starting date for the date dimension
SELECT @DT = '2012-01-01'

--start looping, stop at ending date
WHILE (@DT <= '2020-12-31')
BEGIN
--get information about the data
SELECT @IsWeekend =0
SELECT @YEAR = DATEPART (YEAR, @DT)
SELECT @QUARTER = DATEPART (QUARTER, @DT)
SELECT @MONTH = DATEPART (MONTH , @DT)
SELECT @WEEK = DATEPART (WEEK , @DT)
SELECT @DayofYear = DATEPART (DY , @DT)
SELECT @DayofMonth = DATEPART (DAY , @DT)
SELECT @DayofWeek = DATEPART (DW , @DT)

--note if weeknd or not
IF ( @DayofWeek = 1 OR @DayofWeek = 7 )
BEGIN
SELECT @IsWeekend = 1
END

--add 1 every time we start a new week
IF ( @DayofWeek = 1)
BEGIN
SELECT @CalendarWeek = @CalendarWeek +1
END

--add business rule (need to know complete weeks in a year, so a partial week in new year set to 0)
IF ( @DayofWeek != 1 AND @DayofYear = 1)
BEGIN
SELECT @BusinessYearWeek = 0
END

IF ( @DayofWeek = 1)
BEGIN
SELECT @BusinessYearWeek = @BusinessYearWeek +1
END

--add business rule (start counting business weeks with first complete week)
IF (@BusinessYearWeek =53)
BEGIN
SELECT @BusinessYearWeek = 1
END

--check for leap year
IF ((@YEAR % 4 = 0) AND (@YEAR % 100 != 0 OR @YEAR % 400 = 0))
SELECT @LeapYear =1
ELSE SELECT @LeapYear =0

--insert values into Date Dimension table
INSERT dbo.DateDim (ActualDate, [ActualYear], [QuarterOfYear], [MonthOfYear], [WeekofYear], [DayofYear], [DayofMonth], [DayofWeek], IsWeekend, CalendarWeek, BusinessYearWeek, LeapYear, IsHoliday)
VALUES (@DT, @YEAR, @QUARTER, @MONTH, @WEEK, @DayofYear, @DayofMonth, @DayofWeek, @IsWeekend, @CalendarWeek, @BusinessYearWeek, @LeapYear, 0)

--increment the date one day
SELECT @DT = DATEADD(DAY, 1, @DT)
END


GO
The resulting table
ActualDate ActualYear QuarterOfYear MonthOfYear WeekOfYear DayOfYear DayOfMonth DayOfWeek IsWeekend IsHoliday CalendarWeek BusinessYearWeek LeapYear

---------- ----------- ------------- ----------- ----------- --------- ---------- --------- --------- --------- ------------ ---------------- --------
2012-01-01 2012 1 1 1 1 1 1 1 0 2 1 1
2012-01-02 2012 1 1 1 2 2 2 0 0 2 1 1
2012-01-03 2012 1 1 1 3 3 3 0 0 2 1 1
2012-01-04 2012 1 1 1 4 4 4 0 0 2 1 1
2012-01-05 2012 1 1 1 5 5 5 0 0 2 1 1
2012-01-06 2012 1 1 1 6 6 6 0 0 2 1 1
2012-01-07 2012 1 1 1 7 7 7 1 0 2 1 1
2012-01-08 2012 1 1 2 8 8 1 1 0 3 2 1
2012-01-09 2012 1 1 2 9 9 2 0 0 3 2 1
2012-01-10 2012 1 1 2 10 10 3 0 0 3 2 1
2012-01-11 2012 1 1 2 11 11 4 0 0 3 2 1
2012-01-12 2012 1 1 2 12 12 5 0 0 3 2 1

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