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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which constraint can be defined only at the column level?

A) FOREIGN KEY
B) PRIMARY KEY
C) NOT NULL
D) CHECK
E) UNIQUE

2. Examine the data of the EMPLOYEES table.
EMPLOYEES (EMPLOYEE_ID is the primary key. MGR_ID is the ID of managers and refers to the EMPLOYEE_ID)

Evaluate this SQL statement:
SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.salary,
m.employee_id "Mgr_id", m.emp_name "Manager"
FROM employees e, employees m
WHERE e.mgr_id = m.employee_id
AND e.salary > 4000;
What is its output?

A) Option D
B) Option C
C) Option A
D) Option B

3. Which SQL statement returns a numeric value?

A) SELECT ROUND(hire_date) FROM EMP;
B) SELECT sysdate-hire_date FROM EMP;
C) SELECT TO_NUMBER(hire_date + 7) FROM EMP;
D) SELECT ADD_MONTHS(MAX(hire_Date), 6) FROM EMP;

4. In which scenario would index be most useful?

A) The indexed column contains a wide range of values.
B) The indexed columns are used in the FROM clause.
C) The indexed columns are part of an expression.
D) The indexed column is declared as NOT NULL.

5. Examine the structure of the EMPLOYEES table:

You want to create a SQL script file that contains an INSERT statement. When the script is run, the INSERT statement should insert a row with the specified values into the EMPLOYEES table. The INSERT statement should pass values to the table columns as specified below: Which INSERT statement meets the above requirements?

A) INSERT INTO (SELECT *
FROM employees
WHERE (department_id = 20 AND
department_id = 50)
WITH CHECK OPTION )
VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid', 2000, NULL, &did);
B) INSERT INTO employees
VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid',
2000, NULL, &did IN (20,50));
C) INSERT INTO (SELECT *
FROM employees
WHERE department_id IN (20,50))
VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid', 2000, NULL, &did);
D) INSERT INTO employees
VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid', 2000, NULL, &did);
E) INSERT INTO (SELECT *
FROM employees
WHERE department_id IN (20,50)
WITH CHECK OPTION)
VALUES (emp_id_seq.NEXTVAL, '&ename', '&jobid', 2000, NULL, &did);

Solutions: