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primary key

Automatically guessing foreign key constraints

2017-04-102018-07-15 / Daniel Hutmacher / 4 Comments

With good naming and datatyping conventions, an automated script can help you with the process of creating foreign key constraints across your database, or actually, suggest table relations where you’ve forgotten to implement them.

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Finding primary key candidates

2017-02-212018-07-15 / Daniel Hutmacher / Leave a comment

Probably one of the most common challenges I see when I do ETL and business intelligence work is analyzing a table (or a file) for possible primary keys. And while a bit of domain knowledge, along with a quick eye and some experience will get you really far, sometimes you may need some computational help just to be sure.

Here are some handy tricks to get you started!

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The assert operator and different types of updates

2013-09-292013-09-27 / Daniel Hutmacher / 1 Comment

When you update a column that is tied to a foreign key constraint, SQL Server needs to validate (called “assert“) the new value, in order to make sure that you haven’t added a value with no matching primary key. But in some situations, it’ll assert more than just the column(s) you updated.

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