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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Evaluate the SQL statement
DROP TABLE DEPT:
Which four statements are true of the SQL statement? (Choose four)

A) You cannot roll back this statement.
B) All indexes based on the DEPT table are dropped.
C) All synonyms based on the DEPT table are deleted.
D) All pending transactions are committed.
E) All data in the table is deleted, but the structure of the table is retained.
F) All data in the table is deleted, and the table structure is also deleted.
G) All views based on the DEPT table are deleted.

2. Examine the structure of the EMPLOYEES table:

What is the correct syntax for an inline view?

A) maxsal FROM employees a, (SELECT department_id, max(salary)maxsal FROM employees GROUP BY department_id) b WHERE a.department_id = b.department_id AND a.salary < b.maxsal;
B) SELECT a.last_name, a.salary, a.department_id
FROM employees a
WHERE a.salary =
(SELECT max(salary)
FROM employees b
WHERE a.department_id = b.department_id);
C) SELECT a.last name, a.salary, a.department_id FROM employees a WHERE a.department_id IN (SELECT department_id FROM employees b GROUP BY department_id having salary = (SELECT max(salary) from employees))
D) SELECT a.last_name, a.salary, a.department_id,
E) SELECT a.last_name, a.salary, a.department_id
FROM employees a
WHERE (a.department_id, a.salary) IN
(SELECT department_id, a.salary) IN
(SELECT department_id max(salary)
FROM employees b
GROUP BY department_id
ORDER BY department_id);

3. The EMPLOYEES table has these columns:
LAST NAME VARCHAR2(35) SALARY NUMBER(8,2) HIRE_DATE DATE
Management wants to add a default value to the SALARY column. You plan to alter the table by using this SQL statement:
ALTER TABLE EMPLOYEES MODIFY (SALARY DEFAULT 5000);
What is true about your ALTER statement?

A) Column definitions cannot be altered to add DEFAULT values.
B) A change to the DEFAULT value affects only subsequent insertions to the table.
C) All the rows that have a NULL value for the SALARY column will be updated with the value 5000.
D) Column definitions cannot be altered at add DEFAULT values for columns with a NUMBER data type.

4. The user Alice wants to grant all users query privileges on her DEPT table. Which SQL statement accomplishes this?

A) GRANT select ON dept TO PUBLIC;
B) GRANT select ON dept TO ALL;
C) GRANT select ON dept TO ALL_USERS;
D) GRANT QUERY ON dept TO ALL_USERS

5. Which two statements about views are true? (Choose two.)

A) A view can be created as a join on two or more tables.
B) A view can be created as read only.
C) A view must have aliases defined for the column names in the SELECT statement.
D) A view cannot be created with a GROUP BY clause in the SELECT statement.
E) A view cannot have an ORDER BY clause in the SELECT statement.

Solutions: