Exploring Recursive CTEs by Example
Recursive CTEs can be confusing and scary, so examining some non-standard examples may cast light upon these shadowy demons.
Summer, Summer, Summertime
This Friday Steve Jones has a poll about your summertime activities. What have you done away from work that was memorable?
SQL Monitor Custom Metric: WriteLog Wait Time
During a transaction, data is written to the log cache so that it’s ready to be written to the log file on commit, or can be rolled back if necessary. When the log cache is being flushed to disk, the SQL Server session will wait on the WriteLog wait type. If this happens all the time, it may suggest disk bottlenecks where the transaction log is stored.
Why Put Your Database into Source Control?
Checking program code into source control is a daily ritual for most developers, but versioning database code is less well-understood. Grant Fritchey argues that getting your databases under source control is not only vital for the stability of development and deployment, but it will make your life easier when something does go wrong.
Columnstore Index Changes in SQL Server 2014
SQL Server 2012 introduced columnstore indexes, which can immensely improve the performance of OLAP queries. How were they updated and improved in SQL Server 2014?
Restoring the SQL Server Master Database Even Without a Backup
Many DBAs back up their user databases, but not their system databases. Whatever the reason for the lack of a backup, John Grover explains how to save yourself (mostly) should you ever find yourself with no viable master database and no good backup.
SQL in the City Workshop - Continuous Integration Stairway
Red Gate’s running a half-day training workshop at their UK head office in Cambridge on Aug 8. It’ll show you how to link your database source control repository to your build system as the starting point for continuous integration.
Calculating and Verifying Check Digits in T-SQL
A lot of numbers that we use everyday such as Bank Card numbers, Identification numbers, and ISBN codes, have check digits. As part of the routine data cleansing of such codes we must check that the code is valid- but do we? Dwain Camps shows how it can be done in SQL in such a way that it could even be used in a constraint, and keep bad data out of the database.
Blogs
No Shortcuts for the SQLCMD Batch Terminator: #SQLNewBlogger
By Steve Jones
I was messing around with SQLCMD and I realized something I hadn’t known. I’ve...
Where Is My SQL Agent? Running Scheduled Jobs Against Azure SQL Database
By gbargsley
One of the first things I review when I inherit a new SQL Server...
AgentDBA vs Critical SQL Server
By Arun Sirpal
It’s 07:43. Someone’s already left a message. “Something’s wrong with the DB server.” You...
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Question of the Day
Detecting Characters
I have a SQL Server 2022 English default installation on a server. I want to detect if there are any upper case characters in rows and I have this code:
SELECT CustomerNameID,
CustomerName
FROM dbo.CustomerName
WHERE CustomerName = LOWER(CustomerName)
Here is the sample data I am testing with:
CustomerNameID CustomerName 1 John Smith 2 Sarah Johnson 3 MICHAEL WILLIAMS 4 JENNIFER BROWN 5 david jones 6 emily davis 7 Robert Miller 8 LISA WILSON 9 christopher moore 10 Amanda TaylorHow many rows are returned? See possible answers