2 Answers
New AnswerThat's very debatable, cause Microsoft, Oracle, Mysql, PostgreSQL are just the ones I consider used the most, but all have one thing in common, even when they all have their particular versions of SQL, they all support standard SQL, and my advice to learners is to begin by learning the standard SQL, from there any choice wouldn't bring a big change, and again, all the major database vendors support it. Good luck Unai.
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