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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the structure of the EMPLOYEES table:

You issue these statements:
CREATE table new_emp ( employee_id NUMBER, name VARCHAR2(30));
INSERT INTO new_emp SELECT employee_id , last_name from employees;
Savepoint s1;
UPDATE new_emp set name = UPPER(name);
Savepoint s2;
Delete from new_emp;
Rollback to s2;
Delete from new_emp where employee_id =180;
UPDATE new_emp set name = 'James';
Rollback to s2;
UPDATE new_emp set name = 'James' WHERE employee_id =180;
Rollback;
At the end of this transaction, what is true?

A) You have an employee with the name of James.
B) You have no rows in the table.
C) Your last update fails to update any rows because employee ID 180 was already deleted.
D) You cannot roll back to the same savepoint more than once.

2. Which statement explicitly names a constraint?

A) ALTER TABLE student_grades ADD FOREIGN KEY (student_id) REFERENCES students(student_id);
B) ALTER TABLE student_grades ADD NAMED CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);
C) ALTER TABLE student_grades ADD NAME student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);
D) ALTER TABLE student_grades ADD CONSTRAINT NAME = student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);
E) ALTER TABLE student_grades ADD CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);

3. Which best describes an inline view?

A) a subquery that is part of the FROM clause of another query
B) another name for a view that contains group functions
C) a subquery that can contain an ORDER BY clause
D) a schema object

4. The PRODUCTS table has these columns:
PRODUCT_ID NUMBER (4)
PRODUCT_NAME VARCHAR2(45)
PRICE NUMBER(8,2)
Evaluate this SQL statement:
SELECT *
FROM PRODUCTS
ORDER BY price, product_name;
What is true about the SQL statement?

A) The results are sorted alphabetically.
B) The results are sorted numerically and then alphabetically.
C) The results are sorted numerically.
D) The results are not sorted.

5. What is necessary for your query on an existing view to execute successfully?

A) The underlying tables must be in the same schema.
B) The underlying tables must have data.
C) You need SELECT privileges only on the underlying tables.
D) You need SELECT privileges on the view.

Solutions: