Module 13 (Introduction to SQL - Part 2).pdf

The LEFT JOINThe LEFT JOIN specifies that all records fromthe left-hand table be returned, even if the recordhas no matching records in the right-hand table.If we used a LEFT JOIN in the previousexample, all Employee records would be returned,even employees who generated no Orders.In such a case, the employee record who had zeroothers would be returned exactly once, and thefields that came from the right-hand table wouldbe NULL in that record.