Over the course of SQL's existence, how many entire programming languages have built up entire ecosystems? It doesn't make sense that people would upend their l

Over the course of SQL's existence, how many entire programming languages have built up entire ecosystems? It doesn't make sense that people would upend their language stack every ten years, but then be afraid to learn a new query language. Most developers need to know their programming language deeply; but not necessarily the query language, which might be hidden behind an ORM anyway. In theory, at least, changing the query language would disrupt fewer people than, say, moving from C++ to .NET or Perl to Ruby or Python to Go.