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Since starting my career, the tech stack I use has changed numerous times.  Technologies have come, gone, evolved.  But except for a brief period in 2010 where we thought we could kill it, SQL is the one technology that has stayed around.  It might be the only TECHNICAL knowledge I learned in the first year of my career that is still relavent.  You're probably not making the wrong decision if you decide to build on top of SQL.