Introduction This article shows how common table expressions (CTE) in SQL Server are naturally suited for navigating trees, such as finding its longest path, or diameter. Recall that a tree is an undirected graph where unique paths exist between any two nodes (i.e. vertices). Any node may be selected as its top node, with its […]
2021-04-19
4,541 reads
Introduction This article shows how to script a basic merge between two tables, without using MERGE. This can be handy when you're merging a pair of tables with hundreds of columns, since the script doesn't know anything about them. This technique introduces and populates some auditing columns (IS_DELETED, IS_INSERTED, IS_UPDATED, TRANSACTION_DATE) for each record, and runs fast. […]
2020-04-14
9,540 reads
This article shows how to solve a gaps and islands problem using simple algebra.
2020-03-10
4,652 reads
In this article, we see how SQL can be used to determine matches between two groups, given a set of preferences.
2020-01-23
6,390 reads
Learn a little basic graph theory in this article that replaces a GROUP BY clause.
2019-10-17
6,894 reads
An interesting tutorial for linking SQL Server to a Blackberry device and viewing images.
2011-02-09
11,379 reads
Handling security in an application can be a bit cumbersome. R Glen Cooper brings us a database design technique from the real world that can help you.
2010-04-23 (first published: 2010-04-06)
6,419 reads
In a sequel to his previous article on referential integrity, Glen Cooper looks at some ways to analyze who is getting emails based on a database system.
2009-05-22
4,197 reads
When moving data in related tables between databases, the order sometimes matters. New author Glen Cooper brings us an article that discusses the issues in maintaining referential integrity.
2009-03-20
5,975 reads
By Devin-Knight
Power Virtual Agents empowers subject matter experts to build intelligent conversational bots, using a...
By Steve Jones
I’ve been struggling with an author for a few months. I tried to work...
By Steve Jones
I started to add a daily coping tip to the SQLServerCentral newsletter and to...
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