SQL Inner Join

An SQL INNER JOIN is used to combine rows from two or more tables based on a related column between them. It returns only the matching rows between the tables.etween the tables.

The basic syntax for an INNER JOIN is as follows:

sql

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

Here’s an example to illustrate how it works. Suppose we have two tables: customers and orders. The customers table has columns customer_id, customer_name, and email. The orders table has columns order_id, customer_id, and order_date. We want to retrieve the orders along with the customer information. We can use the following query:

sql

SELECT orders.order_id, customers.customer_name, customers.email, orders.order_date
FROM orders
INNER JOIN customers ON orders.customer_id = customers.customer_id;

In this example, we specify the columns we want to select from both tables. We join the orders table with the customers table using the INNER JOIN keyword and specify the join condition with the ON keyword. The join condition in this case is the equality between the customer_id columns of both tables.

The result of the query will include only the rows where there is a match between the customer_id values in both tables. The selected columns from both tables are included in the result set.

Note that you can join more than two tables using multiple INNER JOIN statements.