Have you used the LEFT JOIN operator in working with databases, and can you give an example of its use?

The LEFT JOIN operator is used to combine two tables so that the resulting set includes all records from the left table and the matching records from the right table, if any. If there are no matches, the right table's fields will be filled with NULL.

Example in SQL:

SELECT users.id, users.name, orders.id AS order_id
FROM users
LEFT JOIN orders ON users.id = orders.user_id;

In this example, we get all users and their orders if they exist. Users without orders will also appear in the result, but the order fields will be NULL.

In Go, when working with databases through the database/sql package, you can use this query as a regular SQL query.