Inner Join is the simplest and most common type of join. It is also known as simple join. It returns all rows from multiple tables where the join condition is met.

Syntax

SELECT columns  
FROM table1   
INNER JOIN table2  
ON table1.column = table2.column;   

Image representation of Inner Join

Oracle INNER JOIN Example

Let's take an example to perform Inner Join on two tables "Suppliers" and "Order1".

Suppliers

Order1

This example will return all rows from "suppliers" and "order1" table where there is a matching supplier_id value in both the suppliers and order1 tables.

Execute the following query

SELECT suppliers.supplier_id, suppliers.supplier_name, order1.order_number  
FROM suppliers   
INNER JOIN order1  
ON suppliers.supplier_id = order1.supplier_id;  

Output