Can people guide me to resources and post any tips on improving one's proficiency in SQL and data base knowledge? I did a Google search already and retrieved some resources. I would appreciate if folks can drop some inputs that are not easy to find on the first page of a Google search. If people have a recommendation of a book, please give a brief reason why a book is a must read.
I have background in OOP languages in C++ and Java. I developed video games using unreal. I work for a data science/analytics firm. No experience in SQL.
Also, anything on SQL and Java coordination would be great!