Technical Article

Moving to MySQL

It’s time. After years of building this site to work with SQL Server, I sold it to Red Gate Software. Part of that transaction meant that I had to work for Red Gate for a period of time afterwards. I think I’ve done a good job in that time, but I don’t own this site anymore, and can’t compete with it contractually.

External Article

The Concept of Cardinal Reciprocity- A Primer

Too many authors in the field of relational theory have neglected the concept of Cardinal Reciprocity. This can cause a number of subtle problems with database design in terms of its derivability, redundancy, and consistency. . Increasingly, this little-understood aspect of relational theory, that emphasises the cardinality of the attributes of tuples in a relation and the reciprocity with isomorphic foreign key restraints, is becoming a hot forum topic.

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Question of the Day

Identities and Sequences I

When thinking of the Identity property for auto incrementing columns and sequences for the same action, which are explicitly linked to increment a number in a table when a new row is added?

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