This figure is a tree depicting the execution plan for the statement in the preceding text.
Step 1, View two_emp_tables, is a clear box that branches to Step 2, Projection, a clear box. Step 2 branches to Step 3, Sort (unique), a clear box. Step 3 branches to Step 4, Union-All, a clear box. Step 4 branches to Step 5, Table Access (full) emp1, and Step 6, Table Access (full) emp2, which are both shaded boxes.