Databases

Learn SQL with Socratica |¦|  SQL Tutorial  |¦|  SQL for Beginners: https://www.youtube.com/watch?v=nWyyDHhTxYU&list=PLi01XoE8jYojRqM4qGBF1U90Ee1Ecb5tt&index=1

A Thorough Introduction to Distributed Systems: https://www.freecodecamp.org/news/a-thorough-introduction-to-distributed-systems-3b91562c9b3c/

Intro to Microservices, Part 4: Dependencies and Data Sharing: https://www.google.com/amp/s/auth0.com/blog/amp/introduction-to-microservices-part-4-dependencies/

In Memory databases internals for system design interviews: https://www.youtube.com/watch?v=zkACt4NYkU4

SQL Query Playground: https://www.w3schools.com/sql/default.asp