日期维度表代码

-- We should create a date dimension table in the database
CREATE TABLE dbo.DimDates (
  [DateKey] int NOT NULL PRIMARY KEY IDENTITY
, [Date] datetime NOT NULL
, [DateName] nVarchar(50)
, [Month] int NOT NULL
, [MonthName] nVarchar(50) NOT NULL
, [Quarter] int NOT NULL
, [QuarterName] nVarchar(50) NOT NULL
, [Year] int NOT NULL
, [YearName] nVarchar(50) NOT NULL
)

-- Since the date table has no associated source table we can fill the data
-- using a SQL script or wait until the ETL process. Either way, here is the 
-- code to use.

-- Create variables to hold the start and end date
DECLARE @StartDate datetime = ‘01/01/1990‘
DECLARE @EndDate datetime = ‘01/01/1995‘ 

-- Use a while loop to add dates to the table
DECLARE @DateInProcess datetime
SET @DateInProcess = @StartDate

WHILE @DateInProcess <= @EndDate
 BEGIN
 -- Add a row into the date dimension table for this date
 INSERT INTO DimDates 
 ( [Date], [DateName], [Month], [MonthName], [Quarter], [QuarterName], [Year], [YearName] )
 VALUES ( 
  @DateInProcess -- [Date]
  , DateName( weekday, @DateInProcess )  -- [DateName]  
  , Month( @DateInProcess ) -- [Month]   
  , DateName( month, @DateInProcess ) -- [MonthName]
  , DateName( quarter, @DateInProcess ) -- [Quarter]
  , ‘Q‘ + DateName( quarter, @DateInProcess ) + ‘ - ‘ + Cast( Year(@DateInProcess) as nVarchar(50) ) -- [QuarterName] 
  , Year( @DateInProcess )
  , Cast( Year(@DateInProcess ) as nVarchar(50) ) -- [Year] 
  )  
 -- Add a day and loop again
 SET @DateInProcess = DateAdd(d, 1, @DateInProcess)
 END

-- Check the table SELECT Top 10 * FROM DimDates

/****** Create the Fact Tables ******/

CREATE TABLE [dbo].[FactTitlesAuthors](
    [TitleKey] [int] NOT NULL,
    [AuthorKey] [int] NOT NULL,
    [AuthorOrder] [int] NOT NULL,
 CONSTRAINT [PK_FactTitlesAuthors] PRIMARY KEY CLUSTERED 
    ( [TitleKey] ASC, [AuthorKey] ASC )
)
GO

-- Adding additional lookup values to the DimDates table 

Set Identity_Insert [DimDates] On -- 把IDENTITY自增ID关掉
INSERT INTO [DWPubsSales].[dbo].[DimDates] ( 
   [DateKey] -- This is normally added automatically
 , [Date]
 , [DateName]
 , [Month]
 , [MonthName]
 , [Quarter]
 , [QuarterName]
 , [Year]
 , [YearName]
 )
VALUES
 ( -1 -- This will be the Primary key for the first lookup value 
 , ‘01/01/1900‘
 , ‘Unknown Day‘
 , -1
 , ‘Unknown Month‘
 , -1
 , ‘Unknown Quarter‘
 , -1 
 , ‘Unknown Year‘ 
 )
,  -- add a second row
( -2 -- This will be the Primary key for the second lookup value
 , ‘02/01/1900‘
 , ‘Corrupt Day‘
 , -2
 , ‘Corrupt Month‘
 , -2
 , ‘Corrupt Quarter‘
 , -2 
 , ‘Corrupt Year‘ 
 )
Set Identity_Insert [DimDates] Off