SELECT '
GO
DBCC CHECKIDENT(''ps.' + TabelNaam  + ''',RESEED,0)'
 
FROM
-- LT: Linked Tables
(SELECT O.name AS TabelNaam
, S.name AS SchemaName
FROM sysobjects AS O
LEFT OUTER JOIN sys.schemas AS S ON O.uid = S.schema_id
WHERE O.TYPE = 'u' AND O.uid=5
AND CHARINDEX('_',O.name)=0
--ORDER BY O.[name]
) AS LT
WHERE SchemaName = 'ps'
ORDER BY TabelNaam

Usefull to export the output to text in stead of grid.

After running the script, copy the result to a new window and run it!

For example:

SELECT DATEDIFF(wk,'2012-01-07', '2012-01-08')

7th of January is saturday, 8th of January is sunday. The answer from SQL Server is 1. That’s true because the new week starts on sunday.

Ok the problem is clear. How can I fix this problem? After doing some research, I found an article about Visual Basic. In VB, there’s a simular function to calculate with dates:

DateDiff(interval, date1, date2 [,firstdayofweek[, firstweekofyear]])

Unfortunately, this last argument isn’t available in Sql Server. So looking around on the internet, I found this.

SET LANGUAGE Dutch

Specifies the language environment for the session. The session language determines the datetime formats and system messages.

After running this SET LANGUAGE command, I run the DateDiff command again:

SELECT DATEDIFF(wk,CAST('2012-01-07' AS DATETIME), CAST('2012-01-08' AS DATETIME) )

And the answer? 4. I don’t understand this. How can this be possible? I think because in Dutch, the date notation is YYYYDDMM so SQL server thinks that I mean July – August and then the answer is correct.

When I reverse the month and day:

SELECT DATEDIFF(wk,CAST('2012-07-01' AS DATETIME), CAST('2012-08-01' AS DATETIME) )

I get the answer: 1. Conclusion: this function will ignore the language setting  and always perform the calculation assuming Sunday as the first day of the week.

This is also interesting; when I cast an integer to datetime, the language setting will be ignored:

There is a workaround for this issue. I found the function @@DATEFIRST. I never have used this one before. Try this:

SET LANGUAGE Dutch
SELECT @@DATEFIRST;
 
SET LANGUAGE us_english
SELECT @@DATEFIRST;

This function returns a number, the first day of the week. In the Netherlands, it is 1. This means monday. In US, it’s 7 and means sunday. So by knowing this, I can create a nice statement to do the calculation.

SET LANGUAGE Dutch;
SELECT DATEDIFF( week,
DATEADD(DAY, -@@DATEFIRST, '20091227'),
DATEADD(DAY, -@@DATEFIRST, '20091228') );

Answer: 1 = Correct.

Easy way: we know that @@DATEFIRST always returns 1 in my situation. So this also works:

SELECT DATEDIFF( week,
DATEADD(DAY, -1, '20120108'),
DATEADD(DAY, -1, '20120109') ) AS WeekDifference;

Friday to Saturday becomes Thursday to Friday: Difference = 0 weeks (before: 0 weeks)
Saturday to Sunday becomes Friday to Saturday: Difference = 0 weeks (before: 1 week)
Sunday to Monday becomes Saturday to Sunday: Difference = 1 weeks (before: 0 week)

Hope this helps you implementing the DateDiff function.

Friends, the final and complete version of Introducing Microsoft SQL Server 2012, by Ross Mistry (@RossMistry) and Stacia Misner (@StaciaMisner), is now ready as a free download! You can download the PDF version of this title here (288 pages; 10.8 MB).

We will update this post soon with links to EPUB and MOBI files. We expect these files to be available by March 23. UPDATE: The EPUB is here, and the MOBI is here.

If you prefer a hard copy of the book, you can order it here for $14.99.

Introducing Microsoft SQL Server 2012 includes 10 chapters:

PART I   DATABASE ADMINISTRATION (by Ross Mistry)

1.   SQL Server 2012 Editions and Engine Enhancements

2.   High-Availability and Disaster-Recovery Enhancements

3.   Performance and Scalability

4.   Security Enhancements

5.   Programmability and Beyond-Relational Enhancements

PART II   BUSINESS INTELLIGENCE DEVELOPMENT (by Stacia Misner)

6.   Integration Services

7.   Data Quality Services

8.   Master Data Services

9.   Analysis Services and PowerPivot

10.   Reporting Services

We are releasing this title to help you learn about the new features and capabilities in SQL Server 2012, which Microsoft released to manufacturing (RTM) on March 6, 2012. You can expect general availability of the product to begin on April 1, 2012.

Please help us share the news about this ebook. And enjoy!

My experience is when using NULL values you need to remember a rule. When concatenating fields like building an adress or full name, you will do someting like this:

SELECT FirstName + ‘ ‘ + LastName FROM dbo.Customer

When the FirstName is empty, the result will be NULL. So when you use NULL as FirstName, you should alway do an extra check for non empty values:

SELECT ISNULL(FirstName,”) + ‘ ‘ + ISNULL(LastName,”) FROM dbo.Customer

Also a very important note is when using numbers. Maybe you have three columns in your datamart for profit which you need to SUM in your report. When one column contains a NULL value, the result will be NULL!

Column1        Column2        Column3
3                        NULL               2

SELECT Column1 + Column2 + Column3 FROM dbo.Table

Result: 0

Correct way:

SELECT ISNULL(Column1,0) + ISNULL(Column2,0) + ISNULL(Column3,0) FROM dbo.Table

Conclusion:
Consided to store an empty string in a NULL value to prevent concatenation problemns and consider to store the value 0 in columns which are used to sum. Maybe a better solution is the store extra fields in the datamart with concatenated data!

Als je de LIKE operator wilt gebruiker in bijvoorbeeld de TABLIX ga je naar Tablix properties, Filter:

Bij Expression vul je in op welke kolom in je dataset je wilt filteren.  Daarna kies je bij Operator de LIKE. Bij de expressie (klik op het knopje Fx) ga je de volgende expressie invoeren

= “*” & “tekst” & “*”

Alle records met het woord “tekst” worden nu gefilterd.

Alles is zo eenvoudig als je het weet

Dit boek is een zelfstudie voor Pentaho Data Integratie en geeft praktijkervaring in het samenstellen van een datavault architectuur. De opdrachten resulteren in een werkende oplossing die als basis kan worden gebruikt voor een BI oplossing in uw eigen omgeving. Het boek is te koop via: http://bit.ly/datavaultimplementeren U kunt dit boek gratis ontvangen als hardcopy en als PDF. Vul het onderstaande formulier in en u ontvangt het boek tijdens een persoonlijk gesprek gratis.

Klik hier voor de website.

The SQL Server 2012 Developer Training Kit includes technical content including labs, demos and presentations designed to help you learn how to develop SQL Server 2012 database and BI solutions. New and updated content will be released periodically and can be downloaded on-demand using the Web Installer Preview.

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