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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Evaluate these two SQL statements:
SELECT last_name, salary , hire_date
FROM EMPLOYEES
ORDER BY salary DESC;
SELECT last_name, salary, hire_date
FROM EMPLOYEES
ORDER BY 2 DESC;
What is true about them?

A) The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
B) The second statement returns a syntax error.
C) The two statements produce identical results.
D) There is no need to specify DESC because the results are sorted in descending order by default.

2. You added a PHONE_NUMBER column of NUMBER data type to an existing EMPLOYEES table. The EMPLOYEES table already contains records of 100 employees. Now, you want to enter the phone numbers of each of the 100 employees into the table.
Some of the employees may not have a phone number available.
Which data manipulation operation do you perform?

A) UPDATE
B) INSERT
C) ADD
D) MERGE
E) You cannot enter the phone numbers for the existing employee records.
F) ENTER

3. You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty.
Which statement accomplishes this task?

A) ALTER TABLE students
ADD CONSTRAINT stud_id_pk PRIMARY KEY student_id;
B) ALTER TABLE students
ADD PRIMARY KEY student_id;
C) ALTER TABLE students
ADD CONSTRAINT PRIMARY KEY (student_id);
D) ALTER TABLE students
ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id);
E) ALTER TABLE students
MODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id);

4. What is true about updates through a view?

A) When you update a view only the constraints on the underlying table will be in effect.
B) When you update a view the constraints on the views always override the constraints on the underlying tables.
C) When you update a view group functions are automatically computed.
D) You cannot update a view with group functions.

5. Examine the structure of the EMPLOYEES table:

You issue these statements:
CREATE table new_emp ( employee_id NUMBER, name VARCHAR2(30));
INSERT INTO new_emp SELECT employee_id , last_name from employees;
Savepoint s1;
UPDATE new_emp set name = UPPER(name);
Savepoint s2;
Delete from new_emp;
Rollback to s2;
Delete from new_emp where employee_id =180;
UPDATE new_emp set name = 'James';
Rollback to s2;
UPDATE new_emp set name = 'James' WHERE employee_id =180;
Rollback;
At the end of this transaction, what is true?

A) Your last update fails to update any rows because employee ID 180 was already deleted.
B) You have no rows in the table.
C) You cannot roll back to the same savepoint more than once.
D) You have an employee with the name of James.

Solutions: