Q:

Is this question suitable for Stack Overflow? Or maybe another Stack Exchange site?

I'm trying to get a deeper understanding of MySQL and its features because in a few job interviews I've been to they've said the key factor in choosing somebody else over me was my somewhat minimal understanding of MySQL.
I want to see what MySQL features people would suggest me to look into to help me get that edge (and also generally improve my knowledge), however, I feel this would/could be rather subjective and not on topic.
Am I right in thinking that?

A:

Yes you are right - this is highly subjective and therefore not a good fit for the Stack Exchange model.
You could try asking in one of chat rooms that discuss SQL or another forum altogether.
I also think that unless you had the actual hands-on experience that the interviewer is looking for, just having the "book knowledge" of a topic won't necessarily get you far in an interview.

A:

It would indeed be off topic. Who can authoritatively answer that? For some people, master-slave data replication may be the thing to look into. For others, some optimisation in JOIN queries. There's no objective answer to this question. The best you could end up with is a list of basically all non-trivial features MySQL offers, which doesn't help one bit. Might as well just read the manual from front to back.

