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which is considered as Basic SQL :

I have read the help of the site mainly this: https://dba.stackexchange.com/help/on-topic

and it is not clear to me: can they exemplify?

for example I want to ask a question about a query that I really consider to be basic, but I am almost sure that the solution is using joins;

Then:

the use of joins at what level is considered for the community of database experts? And if it can be optimized by an advanced function, can it be considered a good question to be published on the site?

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Please don't hesitate to post your question, taking into account other guidelines. The worst that can happen is that it'll be soon closed as "too localised" or "off-topic"; this will be the signal that the crowd here finds it too basic.

You can then take your, already well-prepared, question to Stack Overflow.

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