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SQL Antipatterns, Volume 1
book

SQL Antipatterns, Volume 1

by Bill Karwin
October 2022
Intermediate to advanced content levelIntermediate to advanced
380 pages
9h 35m
English
Pragmatic Bookshelf
Content preview from SQL Antipatterns, Volume 1

Solution: Divide and Conquer

The quote at the beginning of this chapter is similar to the law of parsimony:

The Law of Parsimony

When you have two competing theories that make exactly the same predictions, the simpler one is the better.

What this means to SQL is that when you have a choice between two queries that produce the same result set, choose the simpler one. We should keep this in mind when straightening out instances of this antipattern.

One Step at a Time

If you can’t see a logical join condition between the tables involved in an unintended Cartesian product, that could be because there simply is no such condition. To avoid the Cartesian product, you have to split up a Spaghetti Query into several simpler queries.

In the simple ...

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Publisher Resources

ISBN: 9798888650011Errata Page