December 3, 2012 at 4:27 am
I need to refer to a temp table which has all the months and dynamically shows the years.
for example I need rolling 12 months to show in this table:
November 2012
December 2012
January 2013
February 2013
March 2013
April 2013
May 2013
June 2013
July 2013
August 2013
September 2013
October 2013
And when we are in december I would expect december 2012 to be at the top and an extra line for November 2013. (November 2012 to dissapear).
Is this possible?
December 3, 2012 at 4:38 am
CREATE TABLE #yourTempTable([MonthName] VARCHAR(9), [Year] INT);
WITH CTE(N) AS (SELECT 1 FROM (SELECT 1 UNION ALL SELECT 1)a(N)),
CTE2(N) AS (SELECT 1 FROM CTE x CROSS JOIN CTE y),
CTE3(N) AS (SELECT 1 FROM CTE2 x CROSS JOIN CTE2 y),
TALLY(N) AS (SELECT 0 UNION ALL
SELECT TOP 11 ROW_NUMBER() OVER(ORDER BY (SELECT NULL))
FROM CTE3),
DATETALLY(N) AS (SELECT DATEADD(month, DATEDIFF(month, 0, GETDATE())+N, 0)
FROM TALLY)
INSERT INTO #yourTempTable
SELECT DATENAME(month,N), YEAR(N)
FROM DATETALLY;
SELECT *
FROM #yourTempTable;
December 3, 2012 at 4:43 am
Fantastic thank you
December 3, 2012 at 4:48 am
Sachin 80451 (12/3/2012)
Fantastic thank you
No problem. Do you understand how it works?
December 6, 2012 at 3:33 am
Unfortunately i dont have the faintest idea.
Is there any way you can break it down for me?
December 6, 2012 at 4:02 am
Sachin 80451 (12/6/2012)
Unfortunately i dont have the faintest idea.Is there any way you can break it down for me?
Okay let me thave a go.
Cadavre introduces the concept of a tally table. In his solution he creates the table on the fly which is great but as this numbers table is so useful I highly recommend you create this table permanently in a utility database perhaps?
Here is one way of creating the Tally table:
If exists (select 1 from information_schema.tables where table_name = 'Tally')
drop table dbo.[Tally]
GO
CREATE TABLE dbo.Tally (N INT,CONSTRAINT PK_Tally_N PRIMARY KEY CLUSTERED (N))
DECLARE @Counter INT
SET @Counter = 0
WHILE @Counter <= 10000
BEGIN
INSERT INTO dbo.Tally (N)
VALUES (@Counter)
SET @Counter = @Counter + 1
Now that we have our numbers we can get the first day of each month as follows:
SELECT DATEADD(month, DATEDIFF(month, 0, GETDATE())+N, 0) as N
FROM TALLY
The above bit of code looks complicated but I will try and explain. Our goal is to get one record per month as per yor requirement. To do this we start with:
SELECT DATEDIFF(month, 0, GETDATE())+N
FROM TALLY
This gives us the number of months since 01/01/1900 this is the date you get when you cast the value 0 as a date. So the above query will run somethign like this.
1) Number of months since 01/01/1900 to this day = 1355 + N (tally table starts at 0) so = 1355
2) Number of months since 01/01/1900 to this day = 1355 + N (next value of N is 1 ) so = 1356
and so on.
If we then add the number of months back to 01/01/1900 we will get back 1 record per month
And to get the name we can make the above a derived table or CTE as follows:
select DATENAME(month,N), YEAR(N)
FROM (SELECT DATEADD(month, DATEDIFF(month, 0, GETDATE())+N, 0) as N
FROM TALLY) as a
Hope this helps.
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December 24, 2012 at 7:03 pm
Cadavre (12/3/2012)
CREATE TABLE #yourTempTable([MonthName] VARCHAR(9), [Year] INT);WITH CTE(N) AS (SELECT 1 FROM (SELECT 1 UNION ALL SELECT 1)a(N)),
CTE2(N) AS (SELECT 1 FROM CTE x CROSS JOIN CTE y),
CTE3(N) AS (SELECT 1 FROM CTE2 x CROSS JOIN CTE2 y),
TALLY(N) AS (SELECT 0 UNION ALL
SELECT TOP 11 ROW_NUMBER() OVER(ORDER BY (SELECT NULL))
FROM CTE3),
DATETALLY(N) AS (SELECT DATEADD(month, DATEDIFF(month, 0, GETDATE())+N, 0)
FROM TALLY)
INSERT INTO #yourTempTable
SELECT DATENAME(month,N), YEAR(N)
FROM DATETALLY;
SELECT *
FROM #yourTempTable;
Jeff Moden would probably be disappointed with me if I didn't post this somewhat terser version:
SELECT Month=DATENAME(month, MyDate), Year=DATEPART(year, MyDate)
FROM [master].dbo.spt_values Tally
CROSS APPLY (
SELECT DATEADD(month, number-1, GETDATE())) a (MyDate)
WHERE [Type] = 'P' AND Number BETWEEN 1 AND 12
My thought question: Have you ever been told that your query runs too fast?
My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.
Need to UNPIVOT? Why not CROSS APPLY VALUES instead?[/url]
Since random numbers are too important to be left to chance, let's generate some![/url]
Learn to understand recursive CTEs by example.[/url]
[url url=http://www.sqlservercentral.com/articles/St
December 25, 2012 at 10:14 pm
Sachin 80451 (12/3/2012)
I need to refer to a temp table which has all the months and dynamically shows the years.for example I need rolling 12 months to show in this table:
Since there are no DATETIME reference columns in that table, I have to ask... WHY? What and how are you going to use this? I'm not trying to be difficult here. I just see a world of hurt coming up and I'm trying to help you avoid it. In order to do that, I need to know what and how you intend to use this table.
--Jeff Moden
Change is inevitable... Change for the better is not.
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