Guru: Better Check Constraints
November 11, 2019 Ted Holt
This article has three purposes. If you use check constraints in your database, the purpose is to help you make better use of check constraints. If you don’t use check constraints, the purpose is to encourage you to use them and to point you in the right direction. If you already know all this stuff, the purpose is to goad you to email me and teach me something I don’t know.
The purpose of check constraints is to keep invalid data out of the database. That may seem unnecessary. Isn’t that what the applications are supposed to do? Yes, but …
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