Connecting mySQL with other databases?

A warm hello to everyone here in the forum!

I am reprogramming the backend of a big mail order company and I noticed that this company has a complete mess with their data. Pure chaos!

I thought about offering to rebuild the complete customer file for a good price. What would you say: for a company that also wants to expand, would you rather use a big server as database or would you prefer to use external databases like mySQL? I would like to work with several databases, so that the...

Connecting mySQL with other databases?

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