Views: Similar functionality, but PostgreSQL has updatable views by the DBA writing simple rules that allow it. This means that for simple updatable views, MySQL wins for ease of use, and for complex updatable views, PostgreSQL wins because you can still do them, you just get to do it yourself.
Hmm, maybe it would be worth a while to add (or rather move) a section about programming updatable views between "The Rule System" and "Procedural Languages". The point could be called:
"Updatable Views Using Triggers"
This would make it much easier for beginners to find the subject, and also would make easier to support "yes, we do have updatable statements, only its not automated" statement with just a link to right point in documentation.
