SQL

1-Intro to SQL for Data Science

https://www.datacamp.com/statement-of-accomplishment/course/aeb664bb193134e8ad67e7182a8b95e12a4ae85c

2- Joining data in PostgreSQL

https://www.datacamp.com/statement-of-accomplishment/course/d244f8cca1aa8c89345533c45b2ca66ad986d090