In this article, Glen Cooper provides code that allows you to process a tree, or undirected graph of data. Lots of hierarchies fall into this category and the ability to process them is valuable in many reporting situations.
2023-01-20
2,667 reads
Learn a little basic graph theory in this article that replaces a GROUP BY clause.
2022-07-04 (first published: 2019-10-17)
11,276 reads
This article presents a way that finds a perfect match in any bipartite graph or shows why one cannot exist.
2021-09-06
2,616 reads
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
6,335 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
10,894 reads
This article shows how to solve a gaps and islands problem using simple algebra.
2020-03-10
4,814 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
6,771 reads
An interesting tutorial for linking SQL Server to a Blackberry device and viewing images.
2011-02-09
11,403 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)
6,476 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
4,221 reads
By Steve Jones
Next week I’m heading to the Lowry Conference Center in Denver for the RMOUG...
By Steve Jones
Today’s coping tip is to go to bed in good time and allow yourself...
By SQLBalls
Hello Dear Reader! After a weekend with a lot of activities, it was a...
hi, IF NOT EXISTS (SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME ='abc' AND COLUMN_NAME IN...
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