I recently learned DynamoDB (a non-relational database on AWS). It was fairly easy to learn, basically a one day read through the documentation. It made me grat

I recently learned DynamoDB (a non-relational database on AWS). It was fairly easy to learn, basically a one day read through the documentation. It made me grateful that I first learned SQL databases and spent years working with Oracle and Postgres. Now I can easily choose the best tool for each job. But, if I had first learned a non-relational database, I could see myself looking at the daunting task of learning about database schema design, normalization, sql, pl-sql, triggers, indices, keys, constraints, etc. and throwing my hands up with the shear weight of it all. It certainly isn't a 1 day learn like non-relational databases. I'd probably try to force non-relational databases to fit every use case, even where they aren't the best fit.