I wrote a quiz for the PL/SQL challenge on sequence pseudocolumns, and I noticed that a couple of the answers tricked a lot of people who took the quiz. Time for a blog post on what you can’t do with NEXTVAL!

If you want to try the quiz, do it now before reading on:

Pseudocolumns: Sequence Pseudocolumns from “Weekly SQL Quiz: 31 January – 6 February 2015”.
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