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SQLServerCentral Runs sp_Blitz - Security

Steve Jones from SQLServerCentral.com

A series that looks at the SQLServerCentral database servers using the Brent Ozar Unlimited sp_blitz script. Read about what we learned. More »

Introducing Boomerang - A Notification Framework

Michael Malmgren from SQLServerCentral.com

Boomerang is a notification framework for professional professionals and system integrator's providing service oriented infrastructure with a SQL based rapid development interface.  More »

SQL Server T-SQL Tuning -TVF and Scalar Functions

Additional Articles from SQL Server Performance

A UDF is very convenient for centralising business logic as we can specify a set of business logic in one UDF which references multiple stored procedures and ad-hoc queries. However, they can lead to significant performance degradation due to their demands on the CPU More »

From the SQLServerCentral Blogs - Auto grow–On or Off Straw Poll

David Postlethwaite who contributes to this blog regularly sent me an email this morning asking about Database Auto grow. This... More »

Can you imagine sending the wrong patch to the wrong machines? That's what happened with an Australian bank. Am OS patch was sent to many more machines than it should have. The patch was designed for desktops, but managed to get deployed on servers and resulted in some sort of software corruption.

SQL Server users are fortunate that we rarely have security patches for our platform. There are cumulative updates every other month, but the majority of them aren't aimed at SQL Server, and many of them may not even be required for the host Windows OS. Your organization's policy may require the OS patches, and if they do, you should be aware of when and how they are being deployed. 

Even if patches are not supposed to be deployed to your servers, you should plan on being aware of the deployment date. You never know when an administrator will make a mistake and deploy a patch to your database server and necessitate a restore. I would recommend that you double check your backups and ensure restore scripts are handy on any patch day.

Our computer infrastructure becomes more complex all the time. At the same time, many of us become more specialized, working in a more focused area, and counting on others to manage the parts of our system we do not have time to worry about. People will make mistakes, and we should ensure we can recover our systems from those mistakes.

Steve Jones from SQLServerCentral.com

» Join the debate, and respond to today's editorial on the forums

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Today's Question:

I execute the following T-SQL

DECLARE @A INT,@B INT, @C INT

SET @A = 2

SET @B = 3

SET @C = 4

SELECT  (@A + @B)-@C AS 'Result #1' 

SELECT @A + (@B-@C) AS 'Result #2' 

SELECT (@A + @B) * @C AS 'Result #3' 

SELECT @A + (@B * @C) AS 'Result #4' 

The question is what are the results returned by each of the 4 select statements.

The results are shown as: Result #1, #2, #3, #4

For example, the results might be 1,20,3,41 (not the correct answer)

By bitbucket

Think you know the answer? Click here, and find out if you are right.

This question is worth 1 point in this category: Precedence. We keep track of your score to give you bragging rights against your peers.

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SQL Server 2012 Data Integration Recipes

SQL Server 2012 Data Integration Recipes provides focused and practical solutions to real world problems of data integration. Need to import data into SQL Server from an outside source? Need to export data and send it to another system? SQL Server 2012 Data Integration Recipes has your back. You'll find solutions for importing from Microsoft Office data stores such as Excel and Access, from text files such as CSV files, from XML, from other database brands such as Oracle and MySQL, and even from other SQL Server databases. You'll learn techniques for managing metadata, transforming data to meet the needs of the target system, handling exceptions and errors, and much more.

Get your copy from Amazon today.

We created three tables and some values for the columns

CREATE TABLE TT1 
( ID INT
, Name1 VARCHAR(20)
, Name2 VARCHAR(20)
, Name3 VARCHAR(20)
)
CREATE TABLE TT2 
( ID INT
, Name2 VARCHAR(20)
, Name3 VARCHAR(20)
)
CREATE TABLE TT3 
( ID INT
, Name3 VARCHAR(20)
)

INSERT TT1
VALUES ( 1, 'A', 'B', 'C'),
( 3, 'AA', 'BB', 'CC'),
( 4, 'AAA', 'BBB', 'CCC'),
( 6, 'AAAA', 'BBBB', 'CCCC'),
( 7, 'AAAAA', 'BBBBB', 'CCCCC')
INSERT TT2
VALUES ( 1, 'B','C' ),
( 2, 'BB' ,'CC'),
( 3, 'BBB' ,'CCC'),
( 6, 'BBBB' ,'CCCC'),
( 8, 'BBBBB' ,'CCCCC')
INSERT TT3
VALUES ( 1, 'C' ),
( 3, 'CC'),
( 5, 'CCC'),
( 6, 'CCCC'),
( 8, 'CCCCC')

Then we use following SQL query for the results,

SELECT TT2.ID AS ID1
     , Name1+TT2.Name2 AS N1
     , t1.Name2 AS N2
     , t3.Name3 AS N3
     , COUNT(DISTINCT TT2.ID)
 FROM TT3 t3
  LEFT JOIN TT2 
    ON t3.ID = TT2.ID
  cross JOIN TT1 t1  
 WHERE TT2.ID > 7
 GROUP BY TT2.ID
     , Name1 + TT2.Name2
     , t1.Name2, t3.Name3
 ORDER BY Name1 + TT2.Name2

Does the query run successfully?

By Gary Chinn

Answer: yes

Explanation: The aliases that are used in the query are valid, so the query executes

Ref: Using Table Aliases - http://msdn.microsoft.com/en-us/library/ms187455(v=sql.105).aspx

» Discuss this question and answer on the forums

Training Kit (Exam 70-461): Querying Microsoft SQL Server 2012

Script to replace 5 consecutive digits with special character

Tanmayi Mukundan from SQLServerCentral.com

In a given input string, The script searches for 5 consecutive digits and replaces it with a special character.  More »

Here's a few of the new posts today on the forums. To see more, visit the forums.

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