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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which two statements about sequences are true? (Choose two)

A) You use a NEXTVAL pseudo column to look at the next possible value that would be generated from a sequence, without actually retrieving the value.
B) You use a CURRVAL pseudo column to look at the current value just generated from a sequence, without affecting the further values to be generated from the sequence.
C) If a sequence starting from a value 100 and incremented by 1 is used by more then one application, then all of these applications could have a value of 105 assigned to their column whose value is being generated by the sequence.
D) You use REUSE clause when creating a sequence to restart the sequence once it generates the maximum value defined for the sequence.
E) You use a CURRVAL pseudo column to generate a value from a sequence that would be used for a specified database column.
F) You use a NEXTVAL pseudo column to obtain the next possible value from a sequence by actually retrieving the value from the sequence.

2. Which operator can be used with a multiple-row subquery?

A) NOT IN
B) BETWEEN
C) =
D) <>
E) LIKE
F) IS

3. You need to give the MANAGER role the ability to select from, insert into, and modify existing rows in the STUDENT_GRADES table. Anyone given this MANAGER role should be able to pass those privileges on to others.
Which statement accomplishes this?

A) GRANT select, insert, update ON student_grades TO ROLE manager WITH GRANT OPTION;
B) GRANT select, insert, update ON student_grades TO manager;
C) GRANT select, insert, update ON student_grades TO manager WITH GRANT OPTION;
D) GRANT select, insert, modify ON student_grades TO ROLE manager WITH GRANT OPTION;
E) GRANT select, insert, modify ON student_grades TO manager WITH GRANT OPTION;
F) GRANT select, insert, update ON student_grades TO ROLE manager;

4. You own a table called EMPLOYEES with this table structure:
EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE
What happens when you execute this DELETE statement?
DELETE employees;

A) The data in the EMPLOYEES table is deleted but not the structure.
B) You get an error because the statement is not syntactically correct.
C) The data and structure of the EMPLOYEES table are deleted.
D) You get an error because of a primary key violation.

5. Evaluate this SQL statement:
SELECT e.emp_name, d.dept_name
FROM employees e
JOIN departments d
USING (department_id)
WHERE d.department_id NOT IN (10,40)
ORDER BY dept_name;
The statement fails when executed. Which change fixes the error?

A) prefix the column in the USING clause with the table alias
B) remove the table alias prefix from the WHERE clause
C) prefix the column in the ORDER BY clause with the table alias
D) replace the condition
"d.department_id NOT IN (10,40)"
in the WHERE clause with
"d.department_id <> 10 AND d.department_id <> 40"
E) remove the ORDER BY clause
F) remove the table alias from the SELECT clause

Solutions: