A SQL JOIN lets you retrieve data from 2 or more tables in your database. In this video we give examples of 4 kinds of joins: INNER Joins, LEFT Joins, RIGHT Joins, and FULL Joins (also known as FULL OUTER Joins).
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In this Introduction to SQL Course, you will learn the essential queries needed to work with a relational database: How to create data (INSERT), change existing data (UPDATE), and find data (SELECT and JOINs). You will also learn how to choose a database, install PostgreSQL, speed up queries with indexes, and more.