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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. A subquery can be used to _________.

A) Retrieve data based on an unknown condition
B) Create groups of data
C) Sort data in a specific order
D) Convert data to a different format

2. Which is a valid CREATE TABLE statement?

A) CREATE TABLE EMP*123 AS (empid number(2));
B) CREATE TABLE EMP9$# AS (empid number(2));
C) CREATE TABLE PACKAGE AS (packid number(2));
D) CREATE TABLE 1EMP_TEST AS (empid number(2));

3. 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) name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT value S(e.employee_id, e.first_name ||', '||e.last_name);
B) 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 value S(e.employee_id, e.first_name ||', '||e.last_name);
D) MERGE INTO new_employees cUSING employees e ON (c.employee_id = e.employee_id) WHEN EXISTS THEN UPDATE SET
E) MERGE new_employees c USING employees e ON (c.employee_id = e.employee_id) WHEN EXISTS THEN UPDATE SET
F) 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);
G) name = e.first_name ||','|| e.last_name WHEN NOT MATCHED THEN INSERT valueS(e.employee_id, e.first_name ||', '||e.last_name);
H) MERGE new_employees c FROM employees e ON (c.employee_id = e.employee_id) WHEN MATCHED THEN UPDATE SET

4. Examine the structure of the EMPLOYEES, DEPARTMENTS, and TAX tables.

For which situation would you use a nonequijoin query?

A) To display name, salary, manager ID, and department name of all the employees, even if the employees do not have a department ID assigned.
B) To list the name, job id, and manager name for all the employees.
C) To find the name, salary, and department name of employees who are not working with Smith.
D) To find the number of employees working for the Administrative department and earning less then 4000.
E) To find the tax percentage for each of the employees.

5. What does the TRUNCATE statement do?

A) Removes foreign keys from a table
B) Removes all rows from a table
C) Shortens the table to 10 rows
D) Removes the table
E) Removes all columns from a table

Solutions: