How to pull data with ETL stored procedure using SQL Server - sql-server

Question

In my old database, there is a table Album which stores information about ID, AlbumName, Release_Date (e.g. 01/01/2017) etc.
I want to further break down the Release_Date into a time dimension table, so I create a DimDateAlbum table.
This is the time dimension table I have created.
CREATE TABLE [DimDateAlbum]
(
[DateKey] INT PRIMARY KEY,
[Date] DATETIME NOT NULL,
[Year] INT NOT NULL,
[Quarter] TINYINT NOT NULL,
[QuarterName] VARCHAR(6) NOT NULL, -- January to March: First, April to
June: Second etc
[Month] TINYINT NOT NULL,
[MonthName] VARCHAR(9) NOT NULL, -- January, February etc
[Day] TINYINT NOT NULL, -- Field holds day number of Month
[DayofWeek] TINYINT NOT NULL,
[WeekName] VARCHAR(9) NOT NULL, -- Field displays 1: Monday, 2: Tuesday etc
)
As discussed below: I can insert Release_Date into time dimension table as [DateKey], however, how do I further break down the date into year, quarter, day etc.?
INSERT INTO DimDateAlbum
SELECT
a.Release_Date AS [DateKey],
CONVERT (char(8), a.Release_Date, 112) AS [DateKey],
a.Release_Date AS [Date],
DATEPART(YEAR, a.Release_Date) AS [Year], -- calendar year
DATEPART(QQ, a.Release_Date) AS [Quarter], -- calendar quarter
CASE (qq, a.Release_Date)
WHEN 1 THEN 'First'
WHEN 2 THEN 'Second'
WHEN 3 THEN 'Third'
WHEN 4 THEN 'Fourth'
END AS [QuarterName],
DATEPART(MONTH, a.Release_Date) AS [Month], -- month number of the year
DATENAME(MM, a.Release_Date) AS [MonthName], -- month name
DATEPART(DAY, a.Release_Date) AS [Day], -- day number of the month
DATEPART(DW, a.Release_Date) AS [DayofWeek], -- day number of week
CASE datepart(DW, a.Release_Date)
WHEN 1 THEN 'Monday'
WHEN 2 THEN 'Tuesday'
WHEN 3 THEN 'Wednesday'
WHEN 4 THEN 'Thursday'
WHEN 5 THEN 'Friday'
WHEN 6 THEN 'Saturday'
WHEN 7 THEN 'Sunday'
END AS [WeekName]
FROM
dbo.Album AS a
This code does not work, any help on how to fix it? Thank you so much!

Answer 1

If I understood your correctly you want to populate DimDateAlbum table. I've edited a little bit your table( added identity constraint to avoid writing this field manually) and now it looks like this:
CREATE TABLE [DimDateAlbum]
(
[DateKey] INT IDENTITY CONSTRAINT PK_DimDateAlbum_ID PRIMARY KEY,
[Date] DATETIME NOT NULL,
[Year] INT NOT NULL,
[Quarter] TINYINT NOT NULL,
[QuarterName] VARCHAR(50) NOT NULL, -- January to March: First, April to
[Month] TINYINT NOT NULL,
[MonthName] VARCHAR(9) NOT NULL, -- January, February etc
[Day] TINYINT NOT NULL, -- Field holds day number of Month
[DayofWeek] TINYINT NOT NULL,
[WeekName] VARCHAR(50) NOT NULL, -- Field displays 1: Monday, 2: Tuesday etc
)
And now you can insert your data. I've added a test variable to insert one row, however it can be used for inserting from table:
INSERT INTO dbo.DimDateAlbum
(
DateKey,
Date,
Year,
Quarter,
QuarterName,
Month,
MonthName,
Day,
DayofWeek,
WeekName
)
SELECT
CAST(a.Release_Date AS DATETIME)
, YEAR(CAST(a.Release_Date AS DATETIME)) --
, DATEPART(QUARTER, CAST(a.Release_Date AS DATETIME)) -- Quarter
, CASE -- Quarter Name
WHEN DATEPART(QUARTER, CAST(a.Release_Date AS DATETIME)) = 1 THEN 'January to March' -- Quarter Name
WHEN DATEPART(QUARTER, CAST(a.Release_Date AS DATETIME)) = 2 THEN 'April to June' -- Quarter Name
WHEN DATEPART(QUARTER, CAST(a.Release_Date AS DATETIME)) = 3 THEN 'July to September' -- Quarter Name
WHEN DATEPART(QUARTER, CAST(a.Release_Date AS DATETIME)) = 4 THEN 'October to December' -- Quarter Name
END
, MONTH(CAST(a.Release_Date AS DATETIME)) -- Month number
, DATENAME(MONTH, DATEADD( MONTH, MONTH(CAST(a.Release_Date AS DATETIME)), 0) - 1) -- Month name
, DAY(CAST(a.Release_Date AS DATETIME)) -- 6
, DATEPART(dw, CAST(a.Release_Date AS DATETIME)) -- 5
, DATENAME(dw, CAST(a.Release_Date AS DATETIME)) -- Thursday
FROM Album a
Work example:
DECLARE #FooDate VARCHAR(30) = '2018-12-06 12:10:51.727'
INSERT INTO dbo.DimDateAlbum
(
DateKey,
Date,
Year,
Quarter,
QuarterName,
Month,
MonthName,
Day,
DayofWeek,
WeekName
)
SELECT
CAST(#FooDate AS DATETIME)
, YEAR(CAST(#FooDate AS DATETIME)) --
, DATEPART(QUARTER, CAST(#FooDate AS DATETIME)) -- Quarter
, CASE -- Quarter Name
WHEN DATEPART(QUARTER, CAST(#FooDate AS DATETIME)) = 1 THEN 'January to March' -- Quarter Name
WHEN DATEPART(QUARTER, CAST(#FooDate AS DATETIME)) = 2 THEN 'April to June' -- Quarter Name
WHEN DATEPART(QUARTER, CAST(#FooDate AS DATETIME)) = 3 THEN 'July to September' -- Quarter Name
WHEN DATEPART(QUARTER, CAST(#FooDate AS DATETIME)) = 4 THEN 'October to December' -- Quarter Name
END
, MONTH(CAST(#FooDate AS DATETIME)) -- Month number
, DATENAME(MONTH, DATEADD( MONTH, MONTH(CAST(#FooDate AS DATETIME)), 0) - 1) -- Month name
, DAY(CAST(#FooDate AS DATETIME)) -- 6
, DATEPART(dw, CAST(#FooDate AS DATETIME)) -- 5
, DATENAME(dw, CAST(#FooDate AS DATETIME)) -- Thursday