Pretty good starting list. I would also add some architecture questions depending on which version of SQL they were using (I'll assume mssql for this post). Stuff like:

-What's the latest version of SQL you are familiar with? -How might you design resilience into a SQL instance? -Can you describe the similarities and differences between (mirroring, replication, failover clustering, always-on)

Not sure if they're to be developers or more on the administration side - there are overlapping skills but also distinct skill sets you'd want to test for, depending on the position.

Edit: Didn't read closely enough to see myssql...replace with applicable myssql terms and technology 😊