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Oracle Introduction to Oracle9i: SQL Sample Questions:

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

2. Which two statements about creating constraints are true? (Choose two)

A) Constraint names must start with SYS_C.
B) All constraints must be defines at the column level.
C) Constraints can be created at the same time the table is created.
D) Information about constraints is found in the VIEW_CONSTRAINTS dictionary view.
E) Constraints can be created after the table is created.

3. You need to display the last names of those employees who have the letter "A" as the second character in their names.
Which SQL statement displays the required results?

A) SELECT last_name FROM EMP WHERE last name ='_A%';
B) SELECT last_name FROM EMP WHERE last_name LIKE '_A%';
C) SELECT last_name FROM EMP WHERE last name ='*A%'
D) SELECT last_name FROM EMP WHERE last name LIKE '*A%'

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

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

5. A SELECT statement can be used to perform these three functions:
1.Choose rows from a table.
2.Choose columns from a table
3.Bring together data that is stored in different tables by creating a link between them.
Which set of keywords describes these capabilities?

A) selection, intersection, join
B) selection, projection, join
C) difference, projection, join
D) difference, projection, product
E) intersection, projection, join

Solutions: