T-SQL Challenges

Technical Article

TSQL Challenge 28 - SELECT TOP N articles from each category from a SQL Server 2000 database

  • Article

The challenge is to write a query that returns the articles to be displayed in the home page of the website. N number of articles from each category is to be selected where N is configured in the Categories table. Each category should select the most recent N articles. ArticleID can be used to identify the most recent articles. An article with a higher number indicates a more recent article.

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2010-04-19

2,022 reads

Technical Article

TSQL Challenge 26 - Identify weekly schedule of training programs by course, classroom and timing

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Here is another scheduling problem that deals with the allotment of classrooms for various training programs. Your chalenge is to read the source data and build an output result set that shows the weekly schedule of each training topic and the class room in which training is scheduled.

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2010-03-22

1,783 reads

Technical Article

TSQL Challenge 23 - Calculate the uptime and downtime of a system by reading the data from an audit log

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It is again time to play with some date/time values. This challenge involves reading the audit log entries generated by a monitoring application and create a report that shows the up-time and down-time of a system that the application is monitoring.

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2010-02-08

2,225 reads

External Article

Celko's SQL Stumper: The Class Scheduling Problem

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What can we use in SQL instead of E. F. Codd's T theta operators for best-fit? Joe Celko returns with another puzzle that isn't new, in fact it already features “Swedish”, “Croatian” and “Colombian” solutions in chapter 17 of Joe's 'SQL for Smarties' book. These were all written before CTEs or the new WINDOW functions. Is there now a better solution? Was there one even then? We leave it to the readers to provide the answer!

2010-01-27

1,535 reads

Technical Article

TSQL Challenge 21 - Reading, recognizing and processing graphical representation of digits.

  • Article

Here is a challenge that takes you away from those repetitive boring type of queries that you write over and over again, several times a day. All of us, the database people, are familiar with thinking in set based manner as well as row by row style. Here is something that is very interesting where you might need to process records in a 'three-line-at-a-time' fashion.

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2010-01-11

2,826 reads

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RegEx Functions IV

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Question of the Day

RegEx Functions IV

I have this data in a table in a SQL Server 2025 database: 

EmailAddressID EmailAddress
7              dylan0@ADVENTURE-WORKS.COM
8              Diane1@ADVENTURE-WORKS.COM
If I run this query, which row(s) are returned? 
SELECT top 10
 *
 FROM person.EmailAddress
 WHERE REGEXP_LIKE(EmailAddress, '^D', 'i')
 AND BusinessEntityID IN (7,8)

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