SQL INNER JOIN

SQL INNER JOIN is a type of JOIN that returns only the rows from both tables that have matching values in the specified columns. INNER JOINs are the most common type of JOIN used in SQL and are used to combine data from two or more tables based on a related column between them.

The basic syntax of an SQL INNER JOIN query is as follows:

SELECT column1, column2, ...
FROM table1
INNER JOIN table2
ON table1.column = table2.column;

Here, table1 and table2 are the tables that you want to join, column1, column2, and so on are the columns that you want to select, and column is the related column between the two tables.

For example, the following SQL query uses an INNER JOIN to combine data from two tables:

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

In this example, the query joins the customers table and the orders table based on the customer_id column, and selects the customer_name and order_date columns.

INNER JOINs can be very powerful and flexible, but they can also be complex and difficult to write correctly. It's important to understand how INNER JOINs work and to test your queries carefully to ensure that they return the results you expect.