As for DBMS knowledge, that's something that doesn't routinely fall into the skillset of most focused network administrators.
Perhaps these friends of yours think you may be suited for work as a database administrator, designer, or architect. But that's a whole 'nother story, and I won't address it further here than to say that everything else you've told me does not lead in that direction.
HTH, and good luck with your career planning and development.
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