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> I'd teach them relational algebra...

Agreed. Curious what materials you've found that really drive this home?

Like 90% of googlesearch results simplify things to the point where this is missed.

SQL Server Central has a "Stairway to T-SQL" series that starts off with some light history and then has two fairly decent chapters diving into the mathematics of SQL. It's not intensive by any means, but more than most other resources (and even some textbooks I've read).

[0]: https://www.sqlservercentral.com/stairways/stairway-to-t-sql...

A lot of the Relational Databases course materials in CS programs is built from Oracle educational material; it's probably freely available for many universities. I always assumed the approach outlined by GP is the default way to teach SQL and relational databases.

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