Display the left outer join of Y with itself (Condition Staff_id=Staff_id).

Joining of tables allows you to join multiple tables using different techniques. A part of payroll system of an organisation is shown in Table 1. Assume that the first three tuples are assigned to X and the second three tuples are assigned to be Y. Table 1 Name Age Level Staff_id 0001 Themba 34 7 0002 Julian 43 9 0003 Christopher 26 Null 0004 Mandla 56 10 0005 Tobogo 37 7 0006 Samson 29 Null