Database Design

External Article

Degree of Duplication

  • Article

Technology is constantly moving forward, but it is also helpful to understand how we arrived where we are today. Joe Celko reminisces about the history of database design and how it relates to the concept of ‘Degree of Duplication’ in this article.

2018-02-22

3,419 reads

Blogs

Claude Code Helps Analyze Test Data Manager Log Files

By

I had a customer ask about analyzing their Test Data Manager (TDM) usage to...

PowerPoint to HTML with Claude AI

By

I had an idea for an animated view of a sales tool, and started...

Don’t Miss Out – SQL Server Query Tuning Fundamentals Starts Next Monday!

By

Next Monday, February 9, 2026, my one-day live online training SQL Server Query Tuning...

Read the latest Blogs

Forums

SQL Server 2025 Query Performance Tuning: Troubleshoot and Optimize Query Performance

By Site Owners

Comments posted to this topic are about the item SQL Server 2025 Query Performance...

Is it uncommon for Dev's to have a data model of the source data

By Coffee_&_SQL

This is a generic question. To the moderators, I wasn't sure where to place...

ROLLUP to calculate Month total for all Categories

By Reh23

Good Afternoon, I have built a table with four columns:  Period(Month), Category, Numerator, Denominator....

Visit the forum

Question of the Day

Creating JSON I

On SQL Server 2025, what happens when I run this code:

SELECT JSON_OBJECTAGG( 'City':'Denver')
GO

See possible answers