Help with RDBMS questions

I am a recruiter working with a client who has technical support positions at all levels for theier web-based software product which runs on relational databases. The technical support engineers need to have strong RDBMS knowledge so they can troubleshoot complex problems. Does anyone have good questions I can ask candidates to determine their level of knowledge?

Thanks!
tracim_at_themarlingroup.com
(BTW - if anyone is interested the positions are in Northern California or Burlington, MA)

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