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Oracle Introduction to Oracle9i: SQL Sample Questions:

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

2. Which four are valid Oracle constraint types? (Choose four.)

A) CONSTANT
B) NONUNIQUE
C) CHECK
D) CASCADE
E) NOT NULL
F) PRIMARY KEY
G) UNIQUE

3. The database administrator of your company created a public synonym called HR for the HUMAN_RESOURCES table of the GENERAL schema, because many users frequently use this table.
As a user of the database, you created a table called HR in your schema. What happens when you execute this query?
SELECT *
FROM HR;

A) You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a FULL JOIN.
B) You obtain the results retrieved from the HR table that belongs to your schema.
C) You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a Cartesian product.
D) You obtain the results retrieved from the public synonym HR created by the database administrator.
E) You get an error message because you cannot retrieve from a table that has the same name as a public synonym.

4. Examine the structure of the EMPLOYEES table:

What is the correct syntax for an inline view?

A) 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))
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) 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;
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);

5. The CUSTOMERS table has these columns:

The CUSTOMER_ID column is the primary key for the table.
You need to determine how dispersed your customer base is.
Which expression finds the number of different countries represented in the CUSTOMERS table?

A) COUNT(DIFF(UPPER(country_address)))
B) COUNT(UNIQUE(UPPER(country_address)))
C) COUNT(UPPER(country_address))
D) COUNT DISTINCT UPPER(country_address)
E) COUNT(DISTINCT (UPPER(country_address)))

Solutions: