Which doesn’t matter in many of these simple examples, but this is the thing that really stops you from getting to have your import gravity ecosystem of utilities that modern application programming enjoys. And the continuing buildup of libraries on top of libraries for further complexity.
Instead you’re limited to extensions/packages, which are coupled tightly to the RDBMS internals (which is why you don’t see much of SQL extensions shared across DBs, despite at the end of the day operating all on the same shared framework [relations]) and whatever functionality the database provider has deemed fit to provide (perhaps at cost)