SQL Joins: How to Perform a Simple Join Between Two Database Tables
Joins are an essential tool in SQL for correlating data from different tables. By applying relational algebra, joins allow us to combine information based on specific column values. In this blog post, we will explore a simple example of performing a join between two tables. Let’s consider two tables, people and cars, with the following structures: CREATE TABLE people ( age INT NOT NULL, name CHAR(20) NOT NULL PRIMARY KEY ); CREATE TABLE cars ( brand CHAR(20) NOT NULL, model CHAR(20) NOT NULL, owner CHAR(20) NOT NULL PRIMARY KEY ); To add some sample data, we can execute the following queries:...