There, now we have guaranteed data integrity, and we got a ton of functionality for free while we were at it. Our database rows now manage themselves - pushing themselves back and forth as necessary to maintain the constraints we have designated.
Now, I'll grant you that most PL/pgsql projects will be far easier than this, especially if you are just getting started, but once you get your toes wet in true database programming, you are only going to want more.
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