<ul><li>A database is an organized collection of data that is stored and managed electronically.</li><li>PostgreSQL (PSQL) is an advanced, open-source relational database management system (RDBMS) known for its strong performance, reliability, and extensibility.</li><li>Basic PSQL commands include creating databases, creating tables, inserting data, querying data, altering tables, filtering records with conditions, using 'LIKE' pattern matching, and performing aggregations.</li><li>Aggregation functions like COUNT, SUM, AVG, MAX, MIN, and ROUND are commonly used in PSQL to perform calculations on data.</li></ul>

Day 1: Getting Started with PSQL: The Powerful SQL DataBase.

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