What are advanced SQL joins and how do I use them?

What are advanced SQL joins and how do I use them?

Advanced SQL joins include types like INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN. They allow you to combine rows from two or more tables based on related columns.

Can you explain the difference between INNER JOIN and LEFT JOIN?

Sure! INNER JOIN returns only the rows that have matching values in both tables, while LEFT JOIN returns all rows from the left table and the matched rows from the right table. If there's no match, NULL values are returned for columns from the right table.

What about FULL OUTER JOIN?

FULL OUTER JOIN returns all rows when there is a match in either left or right table records. It combines the results of both LEFT and RIGHT joins.

Can you give me an example query using these joins?

Certainly! Here's an example: SELECT a.id, a.name, b.order_id FROM customers a LEFT JOIN orders b ON a.id = b.customer_id; This retrieves all customers and their orders, if any.