The ANSI SQL specs are notoriously disconnected from what platforms have actually implemented. Initially, I think these standards were meant to guide implementations - but nowadays it feels like they are consistently trying to catch up with each vendor blazing ahead to deliver what is/was needed.
aaronsteers
04/06/2023, 11:07 PM
If I had to give a random guess, I'd say each of the three platforms you metion have something between 30-60% adherence. But to answer with confidence, I'd have to google each one, per header point.