SQL Puzzle 2: Eight Queens
This puzzle was first proposed in 1848 by a composer of chess puzzles called Max Bezzel and has since spawned...
2017-08-04 (first published: 2017-07-19)
2,209 reads
Matthew McGiffen
- Twitter: @MattMcGiffen
- Website: https://matthewmcgiffen.com/
Manually updating Statistics
Even though SQL Server automatically updates statistics in the background for you, you may find there are times when you...
2017-08-01
2,449 reads
Think twice before using table variables
T-SQL Tuesday
For T-SQL Tuesday this month Raul Gonzalez has asked us all to blog about lessons learnt the hard way:
http://www.sqldoubleg.com/2017/07/03/tsql2sday-92-lessons-learned-the-hard-way/
My...
2017-07-24 (first published: 2017-07-11)
9,358 reads
Row-count Estimates when there are no Statistics
I was discussing Cardinality Estimation with a colleague recently and the question came up, what cardinality does SQL Server use...
2017-07-12 (first published: 2017-06-28)
2,891 reads
When do Distribution Statistics Get Updated?
Statistics objects are important to us for allowing SQL to make good estimates of the row-counts involved in different parts...
2017-07-05
792 reads
Statistics and Cardinality Estimation
Cardinality
This is a term originally from Mathematics, generally defined as “The number of objects in a given set or grouping”....
2017-06-30 (first published: 2017-06-20)
5,873 reads
Statistics Parser
In the last post we looked at using the STATISTICS IO and STATISTICS TIME commands to measure query performance.
If you’ve...
2017-06-14 (first published: 2017-05-31)
2,571 reads
What’s an “Index” and how do they work?
What is an Index?
We often hear indexes explained using the analogy of an index in the back of a book....
2017-06-12
1,601 reads
Understanding Keys and Certificates with Always Encrypted
Always Encrypted on SQL 2016 is pretty easy to set up. There’s even a single wizard to guide you through...
2017-06-09 (first published: 2017-05-30)
8,679 reads
Measuring SQL Query Performance
When running workshops on the subject of SQL Query Performance the first question I always ask is how do we measure...
2017-06-08 (first published: 2017-05-24)
37,903 reads
Blogs
The SUM of Nothing: #SQLNewBlogger
By Steve Jones
I caught this interesting item over on Pinal Dave’s blog: Eleven Interview Questions that...
How to Move the SSMS Status Bar to the Top and Color-Code SQL Server Connections
By Hemantgiri
I use color-coded connections in SSMS to distinguish Production, Pre-Production, UAT, and Development. But...
Forums
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Question of the Day
Finding Trailing Spaces
I have some data in a SQL Server 2025 database. It looks like this for the dbo.Customer table:
CustomerID CustomerName PreferredName 1 Steve Steve 2 Andy Andy 3 Brian Brian 4 Allan Allan 5 Devin Devin 6 Steve Steve 7 Sally SallyI want to detect which names have a single trailing space. The CustomerName is a varchar() and the PreferredName is a CHAR(). Does this query detect the problem rows?
SELECT
CustomerID,
CustomerName,
PreferredName
FROM Customer
WHERE CustomerName <> RTRIM(CustomerName)
OR PreferredName <> RTRIM(PreferredName); See possible answers