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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the description of the STUDENTS table:

Which two aggregate functions are valid on the START_DATE column? (Choose two)

A) AVG (start_date, end_date)
B) MIN (start_date)
C) SUM (start_date)
D) MAXIMUM (start_date)
E) COUNT (start_date)
F) AVG (start_date)

2. Which SQL statement returns a numeric value?

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

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

4. Examine the structure of the EMPLOYEES table:
EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25)
Which three statements inserts a row into the table? (Choose three)

A) INSERT INTO employees(first_name,last_name, employee_id) VALUES ( 1000, 'John','Smith');
B) INSERT INTO employees (employee_id, first_name, last_name) VALUES ( 1000, 'John','');
C) INSERT INTO employees( first_name, last_name) VALUES('John','Smith');
D) INSERT INTO employees VALUES ('1000','John',NULL);
E) INSERT INTO employees VALUES ( NULL, 'John','Smith');
F) INSERT INTO employees (employee_id) VALUES (1000);

5. You are the DBA for an academic database. You need to create a role that allows a group of users to modify existing rows in the STUDENT_GRADES table.
Which set of statements accomplishes this?

A) CREATE ROLE registrar; GRANT MODIFY ON student_grades TO registrar; GRANT registrar to user1, user2, user3
B) CREATE NEW ROLE registrar; GRANT ALL ON student_grades TO registrar; GRANT registrar to user1, user2, user3
C) CREATE ROLE registrar; GRANT UPDATE ON student_grades TO registrar; GRANT registrar to user1, user2, user3;
D) CREATE registrar; GRANT CHANGE ON student_grades TO registrar; GRANT registrar;
E) CREATE ROLE registrar; GRANT UPDATE ON student_grades TO registrar; GRANT ROLE registrar to user1, user2, user3

Solutions: