I've been using Django + Django ORM for a decade, and it has covered vast majority of database usage. Entire applications written with zero SQL, and clean DRY c

I've been using Django + Django ORM for a decade, and it has covered vast majority of database usage. Entire applications written with zero SQL, and clean DRY code describing data and allowing to use it in the code. And yet other application written with lots of SQL. The real question is, why anyone using an ORM not learning SQL, how the the thing they are mapping to objects actually works?