Mastering SQL Inner Join: A Comprehensive Guide With Practical Examples

SQL (Structured Query Language) is the standard language for managing relational databases. It is a powerful tool that allows us to store, manipulate, and retrieve data efficiently. One of the most commonly used operations in SQL is the JOIN operation, which allows us to combine data from two or more tables into a single result set.

The INNER JOIN clause is one of the most frequently used types of JOIN in SQL. It combines rows from two or more tables based on a related column between them. The INNER JOIN returns only the rows that have matching values in both tables, i.e., the intersection of the two tables. 

The following picture illustrates the Venn diagram of INNER JOIN. The shaded area in the diagram represents the common values shared between the two tables.

SQL Inner Join