How to write DRY SQL in MySQL – Part 1: Views

…how come I took so long to think of this? Ex-dba…blah…

Gruff's Tech Tips

Writing DRY code is a fundamental principle of software development.  DRY, or Don’t Repeat Yourself, was popularised by the 1999 Pragmatic Programmer coding practices book (the alternative being WET code, meaning Write Everything Twice, or possibly “We Enjoy Typing”).

DRY code is optimal, not just because it’s less typing, but because when you come to refactor code (make changes to it), it’s much easier if there’s a single place where that change needs to be made.  If you’ve repeated the same code blocks all over the place, you’ll need to go edit all of them.

The wider principle of DRY is, “Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.”  Given that one of the fundamental design principles of good Relational Databases, Normalisation, is also about removing redundancy and repetition, you’d imagine that relational database would support DRY coding practices well.

Unfortunately, writing database server code (SQL queries, stored procedures, triggers, etc.) in…

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