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SQL Domains

I’ve not come across SQL domains before. But this blog post, “Or you could use a domain,” nicely shows how you can use them in a database to encapsulate a data type. It seems a bit like using typedef in C—you can’t create new types, but you can create similiar ones based on preexisting ones. Although domains allow you to have much more interesting constraints, looking at the documentation for CREATE DOMAIN.

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