Libraries are the main driver for standardization — end-logic doesn’t move between systems very often anyways, and especially with databases where you typically

Libraries are the main driver for standardization — end-logic doesn’t move between systems very often anyways, and especially with databases where you typically don’t ship SQL to random environments and hope it works (they are largely designed as centralized systems after all). But the language has no real extension system defined, so everything new gets defined as new language keywords instead of eg a new library/function, which arbitrarily get added as RDBMS’s try to differentiate their feature set. What extension systems do exist typically hook directly into the engine itself, are unique to the DB and have little to no hope of being “shareable” So the standardization inevitably is less a standard and more of a vague guideline.