I think they meant that changing RDBMS is hard, even though in theory you should be able to because you're "just using standardised SQL". As it is with cloud pr

I think they meant that changing RDBMS is hard, even though in theory you should be able to because you're "just using standardised SQL". As it is with cloud providers, in theory they're mostly the same, except in all the places they aren't, which make it hard to move once you're using one.