Evaluate this SQL statement:
SELECT e.EMPLOYEE_ID,e.LAST_NAME,e.DEPARTMENT_ID, d.DEPARTMENT_NAME
FROM EMPLOYEES e, DEPARTMENTS d
WHERE e.DEPARTMENT_ID = d.DEPARTMENT_ID;
In the statement, which capabilities of a SELECT statement are performed?
A.
selection, projection, join
B.
selection, intersection, join
C.
intersection, projection, join
D.
difference, projection, product
E.
difference, projection, join
Explanation:
Selection, projection and join capabilities of a SELECT statement are performed in this view.
What’s “projection”?
A
projection:retreving columns