Introduction to SQL

What is SQL, what is a database, and why every data professional must know SQL. ## Lesson objectives In this lesson, we will not start with practical SQL queries yet. First, we will understand what SQL is, why it is used, and how the basic database structure works. Before learning SQL queries, it is important to understand a few basic ideas. If database, table, row, column, and query are clear, the next SQL topics will be easier to understand.