What results will be obtained when performing a LEFT JOIN with a table that lacks corresponding rows, and how is this reflected in the final data?

When performing a LEFT JOIN in SQL, all rows from the left table are selected, and only those from the right table that meet the join condition. If there are no matching rows in the right table for a row in the left table, the fields from the right table will be filled with NULL in the final result.

This allows you to keep all data from the left table, even if there are no related data in the right table.

Example:

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

If a user has no orders, the order_id field will be NULL, but the user will still be present in the result.