Opinions on learning SQL

calmstateofmind

Distinguished
w3schools is a great reference, but it definitely shouldn't be the only resource you use when learning SQL.

I recommend using this site to develop SQL skills, coupled with w3s for lookup. That site is structured similarly to w3s, but it will also test your knowledge along the way. And also, at the bottom of the page there are various relational databases that each have 15 problems with varying difficulties. It's great practice using SQL, and also strengthens your ability to read DB schemas on the fly.