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I've just learned SQL by doing. You're not including extensions here like stored procs and such right?

I have a lot of "where my_func(x, y, z) = 1" type where clauses, so seem that would do what you say, no?

That's a hack. The where clause itself is not decomposable. But if you made every where clause a single function taking in multiple parameters than yes that function is composable but you're taking extra steps to do a non-traditional coding style.

Not even sure if stored procedures are part of the sql standard.... these seem to me to be just specific syntax additions added on by specific databases.

I mean it works so why not. I could code all my SQL this way.

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