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Oracle Introduction to Oracle9i: SQL Sample Questions:

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

A) A single row subquery can retrieve data from more than one table.
B) A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.
C) A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.
D) A single row subquery can retrieve data from only one table.
E) A SQL query statement can display data from table B that is referred to in its subquery, without including table B in its own FROM clause.
F) A multiple-row subquery cannot be used in a condition where the LIKE operator is used for comparison.

2. Which two statements accurately describe a role? (Choose two.)

A) A role can have a maximum of 100 privileges contained in it.
B) A role can be given to a maximum of 1000 users.
C) A role is a named group of related privileges that can be granted to the user.
D) A user can have access to a maximum of 10 roles.
E) Privileges are given to a role by using the CREATE ROLE statement.
F) A user can have access to several roles, and several users can be assigned the same role.

3. Evaluate the SQL statement:
TRUNCATE TABLE DEPT;
Which three are true about the SQL statement? (Choose three.)

A) An attempt to use DESCRIBE on the DEPT table after the TRUNCATE statement executes will display an error.
B) It does not release the storage space used by the table.
C) You can roll back the deletion of rows after the statement executes.
D) It releases the storage space used by the table.
E) You can NOT roll back the deletion of rows after the statement executes.
F) You must be the owner of the table or have DELETE ANY TABLE system privileges to truncate the DEPT table

4. Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:
EMPLOYEES EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE
NEW_EMPLOYEES EMPLOYEE_ID NUMBER Primary Key NAME VARCHAR2(60) Which MERGE statement is valid?

A) MERGE INTO new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN MATCHED THEN UPDATE SET c.name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT VALUES (e.employee_id, e.first_name ||', '||e.last_name);
B) MERGE new_employees c FROM employees e ON (c.employee_id = e.employee_id) WHEN MATCHED THEN UPDATE SET c.name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT INTO new_employees VALUES (e.employee_id, e.first_name ||', '||e.last_name);
C) MERGE new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN EXISTS THEN UPDATE SET c.name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT VALUES (e.employee_id, e.first_name ||', '||e.last_name);
D) MERGE INTO new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN EXISTS THEN UPDATE SET c.name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT VALUES(e.employee_id, e.first_name ||', '||e.last_name);

5. 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) There is no need to specify DESC because the results are sorted in descending order by default.
C) The two statements produce identical results.
D) The second statement returns a syntax error.

Solutions: