Celina works as a Database Administrator for Tech Mart Inc. The company uses an Oracle
database. The database contains a table named Employees. Following is the structure of the
table:
EmpID NUMBER (5) PRIMARY KEY
EmpName VARCHAR2 (35) NOT NULL
Salary NUMBER (9, 2) NOT NULL
Commission NUMBER (4, 2)
ManagerName VARCHAR2 (25)
ManagerID NUMBER (5)
Celina wants to display the names of employees and their managers, using a self join. Which of
the following SQL statements will she use to accomplish this?
Each correct answer represents a complete solution. Choose two.
A.
SELECT e.EmpName, m.ManagerName
FROM Employees e, Employeesm
WHERE e.EmpID = m.ManagerID;
B.
SELECT e.EmpName, m.ManagerName
FROM Employees e INNER JOIN Employeesm
ON e.EmpID = m.ManagerID;
C.
SELECT e.EmpName, m.ManagerName
FROM Employees e LEFT OUTER JOIN Employees m
ON e.EmpID = m.ManagerID;
D.
SELECT e.EmpName, m.ManagerName
FROM Employees e SELF JOIN Employeesm
ON e.EmpID = m.ManagerID;
Explanation: