sql

PostgreSQL is a powerful and advanced open-source enterprise-class database known to support JSON (non-relational) and SQL (relational) querying. The database is very stable, it has been around for more than twenty years, and a good reason it has a high level of correctness, integrity, and resilience. The database is used by many mobiles, analytical, web, and geospatial applications as primary storage for their data. The latest invention in this database is PostgreSQL 12.

So, you are interested in learning more about SQL but are not sure how to start. There are many Textbooks and classes available to teach you the ins and outs of SQL. Many standard dimension queries that makeup SQL and understands how they will help you tremendously when applying them to your data science projects.