Calendar table for Data Warehouse

Question

For my data warehouse, I am creating a calendar table as follows:

SET NOCOUNT ON

DROP Table dbo.Calendar
GO
Create Table dbo.Calendar
(
    CalendarId    Integer NOT NULL,
    DateValue    Date NOT NULL,
    DayNumberOfWeek   Integer NOT NULL,
    NameOfDay    VarChar (10) NOT NULL,
    NameOfMonth    VarChar (10) NOT NULL,
    WeekOfYear    Integer NOT NULL,
    JulianDay    Integer NOT NULL,
    USAIsBankHoliday  Bit  NOT NULL,
    USADayName    VarChar (100) NULL,
)
ALTER TABLE dbo.Calendar ADD CONSTRAINT
    DF_Calendar_USAIsBankHoliday DEFAULT 0 FOR USAIsBankHoliday
GO
ALTER TABLE dbo.Calendar ADD CONSTRAINT
    DF_Calendar_USADayName DEFAULT '' FOR USADayName
GO

Declare @StartDate  DateTime = '01/01/2000'
Declare @EndDate    DateTime = '01/01/2020'

While @StartDate < @EndDate
Begin
    INSERT INTO dbo.Calendar 
    (
     CalendarId, 
     DateValue, 
     WeekOfYear,
     DayNumberOfWeek,
     NameOfDay,
     NameOfMonth,
     JulianDay
    )
    Values 
    (
     YEAR (@StartDate) * 10000 + MONTH (@StartDate) * 100 + Day (@StartDate), --CalendarId
     @StartDate,     -- DateValue
     DATEPART (ww, @StartDate), -- WeekOfYear
     DATEPART (dw, @StartDate), -- DayNumberOfWeek
     DATENAME (dw, @StartDate), -- NameOfDay
     DATENAME (M, @StartDate), -- NameOfMonth
     DATEPART (dy, @StartDate) -- JulianDay
    )

    Set @StartDate += 1
End

--=========================== Weekends
-- saturday and sunday
UPDATE dbo.Calendar SET USAIsBankHoliday = 1, USADayName += 'Weekend, ' WHERE DayNumberOfWeek IN (1, 7) 


--=========================== Bank Holidays
-- new years day
UPDATE dbo.Calendar SET USAIsBankHoliday = 1, USADayName += 'New Year''s Day, '  WHERE (CalendarId % 2000) IN (101)

-- memorial day (last Monday in May)
UPDATE dbo.Calendar 
SET USAIsBankHoliday = 1, 
    USADayName += 'Memorial Day, '  
WHERE 1=1
AND CalendarId IN 
    (
     SELECT MAX (CalendarId)
     FROM dbo.Calendar 
     WHERE MONTH (DateValue) = 5 
     AND DATEPART (DW, DateValue)=2
     GROUP BY YEAR (datevalue)
    )

-- independence day
UPDATE dbo.Calendar SET USAIsBankHoliday = 1, USADayName += 'Independence Day, '  WHERE (CalendarId % 2000) IN (704)

-- labor day (first Monday in September)
UPDATE dbo.Calendar 
SET USAIsBankHoliday = 1, 
    USADayName += 'Labor Day, '  
WHERE 1=1
AND CalendarId IN 
    (
     SELECT MIN (CalendarId)
     FROM dbo.Calendar 
     WHERE MONTH (DateValue) = 9
     AND DATEPART (DW, DateValue)=2
     GROUP BY YEAR (datevalue)
    )

-- thanksgiving day (fourth Thursday in November)
UPDATE dbo.Calendar 
SET USAIsBankHoliday = 1, 
    USADayName += 'Thanksgiving Day, '  
WHERE 1=1
AND CalendarId IN 
    (
     SELECT Max (CalendarId)-2
     FROM dbo.Calendar 
     WHERE MONTH (DateValue) = 11
     AND DATEPART (DW, DateValue)=7
     GROUP BY YEAR (datevalue)
    )

-- christmas
UPDATE dbo.Calendar SET USAIsBankHoliday = 1, USADayName += 'Christmas Day, '  WHERE (CalendarId % 2000) IN (1225)

--=========================== Other named days
-- new years eve
UPDATE dbo.Calendar SET USADayName += 'New Year''s Eve, '  WHERE (CalendarId % 2000) IN (1231)

-- black friday (day after thanksgiving day)
UPDATE dbo.Calendar SET USADayName += 'Black Friday, '  WHERE CalendarId IN (SELECT CalendarId+1 From dbo.Calendar Where USADayName like '%Thanksgiving%')

-- christmas eve
UPDATE dbo.Calendar SET USADayName += 'Christmas Eve, '  WHERE (CalendarId % 2000) IN (1224)

-- boxing day
UPDATE dbo.Calendar SET USADayName += 'Boxing Day, '  WHERE (CalendarId % 2000) IN (1226)

--=========================== Remove trailing comma
UPDATE dbo.Calendar SET USADayName = SubString (USADayName, 1, LEN (USADayName) -1) WHERE LEN (USADayName) > 2

SELECT * FROM dbo.Calendar

Here is the output of this command

I have seen similar structures implemented in various flavours by data architects.

My question is: What other data warehousing / dimension style useful information can I add to this table structure?

Answer 1

• Quarter
• Year
• Financial/Accounting Year
• Financial/Accounting Quarter
• isWeekend
• isWeekday
• isWorkDay
• WeekId (weeks since start of year)
• isLastDayofMonth
• DaysSince (e.g. days since 1/1/2000)