I am trying to learn how to use SQL. Any recommendation on online course or websites for it? (I will use Periscope)
I liked the sql for data analysts on Udacity. Free, simple, and just enough to get started.
W3school
Mode Analytics SQL school
It is great. Currently studying there for a Facebook DSA position
Udacity is good, Udemy. Used both and have good materials, pace and quizzes to test your knowledge as you advance.
W3schools
Sqlzoo.net is pretty good
Second sqlzoo for getting started.