Section 12 1. When mapping supertypes, relationships at the supertype level transform as usual. Relationships at subtype level are implemented as foreign keys, but the foreign key columns all become mandatory. True or False? Mark for Review (1) Points True False (*) Correct 2. Which of the following are reasons why you should consider using a Subtype Implementation? Mark for Review (1) Points The resulting table will reside in a single database and be used by just ONE user. When the common access paths for the supertypes are different. Business functionality and business rules, access paths and frequency of access are all very different between subtypes. (*) Most of the relationships are at the supertype level Correct 3. It is possible to implement non-transferability via a simple Foreign Key Relationship. True or False? Mark for Review (1) Points True False (*) Correct 4. Many to many relationships are implemented via a structure called a: ________________ Mark for Review

(1) Points Supertype Intersection Table (*) Intersection Entity Subtype Incorrect. Refer to Section 12 5. Entity integrity refers to Mark for Review (1) Points Tables always containing text data Tables always containing numeric data Columns having Primary Keys, Foreign Keys, Unique Keys and Check constraints defined in the database. Tables having Primary Keys, Foreign Keys, Unique Keys and Check constraints defined in the database. (*) Incorrect. Refer to Section 12 6. If a primary key is a set of columns then one column must be null. True or False? Mark for Review (1) Points True False (*) Correct 7. A table must have a primary key. True or False? Mark for Review (1) Points

True False (*) Correct 8. Identify all of the incorrect statements that complete this sentence: A primary key is: (Choose three) Mark for Review (1) Points (Choose all correct answers) A single column that uniquely identifies each column in a table (*) One or more columns in a table that uniquely identifies each row in that table A set of columns in one table that uniquely identifies each row in another table (*) Only one column that must be null (*) Correct 9. Why would this table name NOT work in an Oracle database? this_year_end+next_year Mark for Review (1) Points Table names must begin with an alphabetic character Too long The Plus sign + is not allowed in object names (*) None of the above Correct 10. The transformation from an ER diagram to a physical design involves changing terminology. Primary Unique Identifiers in the ER diagram become __________ and relationships become ____________. Mark for Review (1) Points

Foreign keys, Primary keys Primary keys, Foreign keys (*) Foreign keys, mandatory business rules Unique Keys, Primary keys Incorrect. Refer to Section 12

Section 12 11. In an Oracle database, why would 1_TABLE not work as a table name? Mark for Review (1) Points The database does not understand all capital letters There is no problem here. You can create a table called 1_TABLE. Object names must not start with a number. They must begin with a letter (*) TABLE is a reserved word Correct Section 13 12. What command will return data from the database to you? Mark for Review (1) Points FETCH GET SELECT (*) RETURN

Correct. 13. The DESCRIBE command returns all rows from a table. True or False? Mark for Review (1) Points True False (*) Correct. Section 16 14. Which SQL keyword specifies that an alias will be substituted for a column name in the output of a SQL query? Mark for Review (1) Points AS (*) OR AND SUBSTITUTE Correct. 15. In a SQL statement, which clause specifies one or more columns to be returned by the query? Mark for Review (1) Points SELECT (*) FROM WHERE

Any of the above options, you can list columns wherever you want to in a SELECT statement. Correct. 16. The SELECT statement retrieves information from the database. In a SELECT statement, you can do all of the following EXCEPT: Mark for Review (1) Points Projection Manipulation (*) Joining Selection Correct. 17. When you use the SELECT clause to list one or two columns only from a table and no WHERE clause, which SQL capability is used? Mark for Review (1) Points Joining only Selection only Projection only (*) Projection and Selection Correct. 18. You query the database with this SQL statement: SELECT * FROM transaction WHERE product_id = 4569;

Which SQL SELECT statement capabilities are achieved when this statement is executed?

Mark for Review (1) Points Selection only (*) Projection only Selection and projection only Projection, selection and joining Correct. 19. Which SQL statement will return an error? Mark for Review (1) Points SEL * FR sky; (*) select star from sky; SELECT star FROM sky; SELECT * FROM sky; Incorrect. See Section 16 20. In a SELECT clause, what is the result of 2 + 3 * 2? Mark for Review (1) Points 6 8 (*) 10 13 Correct.

Section 16

21. Would it be a good idea to model age as an attribute of STUDENT? Mark for Review (1) Points Yes Maybe it could stop us having to calculate someone's age every time we need it Sometimes No - it breaks the Normalization rules (*) Correct 22. Any Non-UID must be dependant on the entire UID. True or False? Mark for Review (1) Points True (*) False Correct Section 17 23. You need to display all the employees whose last name starts with the letters Sm . Which WHERE clause should you use? Mark for Review (1) Points WHERE last_name LIKE 'Sm%' (*) WHERE last_name LIKE '%Sm' WHERE last_name LIKE '_Sm' WHERE last_name LIKE 'Sm_' Incorrect. See Section 17

24. You want to retrieve a list of customers whose last names begin with the letters Fr . Which symbol should you include in the WHERE clause of your SELECT statement to achieve the desired result? Mark for Review (1) Points % (*) ~ # * Correct. See Section 17 25. If the EMPLOYEES table has the following columns, and you want to write a SELECT statement to return the employee last name and department number for employee number 176, which of the following SQL statements should you use? Name Type Length EMPLOYEE_ID NUMBER 22 FIRST_NAME VARCHAR2 20 LAST_NAME VARCHAR2 25 EMAIL VARCHAR2 25 PHONE_NUMBER VARCHAR2 20 SALARY NUMBER 22 COMMISSION_PCT NUMBER 22 MANAGER_ID NUMBER 22 DEPARTMENT_ID NUMBER 22

Mark for Review (1) Points SELECT last_name, department_id FROM employees WHERE employee_id = 176; (*) SELECT last_name, department_id FROM employees WHERE employee_id equals 176;

SELECT first_name, employee_id FROM employees WHERE employee_id = 176; SELECT last_name, employee_id FROM employees WHERE employee_id equals 176; Correct. 26. You need to display all the values in the EMAIL column that contains the underscore (_) character as part of that email address. The WHERE clause in your SELECT statement contains the LIKE operator. What must you include in the LIKE operator? Mark for Review (1) Points The ESCAPE option (\) and one or more percent signs (%) The (+) operator A percent sign (%) The ESCAPE option (\) (*) Correct. See Section 17 27. Evaluate this SELECT statement: SELECT last_name, first_name, salary FROM employees;

How will the heading for the SALARY column appear in the display by default in Oracle Application Express? Mark for Review (1) Points The heading will display with the first character capitalized and centered. The heading will display with the first character capitalized and left justified.

The heading will display as uppercase and centered. (*) The heading will display as uppercase and left justified. Correct. 28. Which operator is used to combine columns of character strings to other columns? Mark for Review (1) Points * / + || (*) Correct. See Section 17 29. Which comparison condition would you use to select rows that match a character pattern? Mark for Review (1) Points IN LIKE (*) ALMOST SIMILAR Correct. 30. Which statement best describes how column headings are displayed by default in Oracle Application Express: Mark for Review (1) Points Column headings are displayed left-justified and in lowercase.

Column headings are displayed left-justified and in uppercase. Column headings are displayed centered and in uppercase. (*) Column headings are displayed centered and in mixed case. Correct. See Section 17

Section 17 31. You need to display only unique combinations of the LAST_NAME and MANAGER_ID columns in the EMPLOYEES table. Which keyword should you include in the SELECT clause? Mark for Review (1) Points ONLY UNIQUE DISTINCT (*) DISTINCTROW Correct. See Section 17 32. Which symbol represents the not equal to condition? Mark for Review (1) Points # '+' != (*) ~ Incorrect. See Section 17. 33. The Concatenation Operator does which of the following? Mark for Review (1) Points

Links rows of data together inside the database. Links two or more columns or literals to form a single output column (*) Is represented by the asterisk (*) symbol Separates columns. Correct. See Section 17 34. The PRODUCT table contains these columns: PRODUCT_ID NUMBER(9) DESCRIPTION VARCHAR2(20) COST NUMBER(5,2) LOCATION_ID VARCHAR2(10)

You want to display product costs with these desired results: 1. The cost displayed for each product is increased by 10 percent. 2. The product location id must be 4859, 9789, or 9898. 3. Ten percent of the original cost is less than $10. Which statement should you issue? Mark for Review (1) Points SELECT product_id, cost * 1.10 FROM product WHERE cost * .10 < 10.00 AND location_id IN (4859, 9789, 9898); (*) SELECT product_id, cost * .10 FROM product WHERE cost * 1.10 > 10.00 AND location_id IN (4859, 9789, 9898); SELECT product_id, cost * 1.10 FROM product WHERE cost * 1.10 < 10.00 AND location_id = (4859, 9789, 9898); SELECT product_id, cost * 1.10

FROM product WHERE cost * .10 > 10.00 AND location_id = (4859, 9789, 9898); Correct. See Section 17 35. If you write queries using the BETWEEN operator it does not matter in what order you enter the values, i.e. BETWEEN low value AND high value will give the same result as BETWEEN high value and low value. True or False? Mark for Review (1) Points True False (*) Correct. 36. The EMPLOYEES table contains these columns: EMPLOYEE_ID NUMBER(9) PrimaryKey LAST_NAME VARCHAR2 (20) FIRST_NAME VARCHAR2 (20) DEPARTMENT_ID NUMBER(5) NOT NULL MANAGER_ID NUMBER(9) NOT NULL

Evaluate these two SELECT statements: 1. SELECT DISTINCT employee_id, department_id, manager_id FROM employees; 2. SELECT employee_id, department_id, manager_id FROM employees;

Which of the following statements is true? Mark for Review (1) Points The two statements will display the same data. (*) The first statement will display a particular DEPARTMENT_ID only once. The first statement will NOT display values from all of the rows in the EMPLOYEES table The second statement could display a unique combination of the EMPLOYEE_ID, MANAGER_ID, and DEPARTMENT_ID values more than once.

Correct. See Section 17 Section 18 37. Which logical operator returns TRUE if either condition is true? Mark for Review (1) Points OR (*) AND NOT BOTH Correct. 38. Which clause would you include in a SELECT statement to sort the rows returned by the LAST_NAME column? Mark for Review (1) Points ORDER BY (*) WHERE FROM HAVING Correct. 39. Which statement about the logical operators is true? Mark for Review (1) Points The order of operator precedence is AND, OR, and NOT. The order of operator precedence is AND, NOT, and OR.

The order of operator precedence is NOT, OR, and AND. The order of operator precedence is NOT, AND, and OR. (*) Correct. 40. The ORDER BY clause always comes last. True or False? Mark for Review (1) Points True (*) False Correct.

Section 18 41. Which of the following is TRUE regarding the logical AND operator? Mark for Review (1) Points TRUE AND TRUE return FALSE TRUE AND FALSE return TRUE FALSE AND TRUE return NULL TRUE AND FALSE return FALSE (*) Correct. 42. Which statement about the ORDER BY clause is true? Mark for Review (1) Points You can use a column alias in the ORDER BY clause. (*) The default sort order of the ORDER BY clause is descending. The ORDER BY clause can only contain columns that are included in the SELECT list.

The ORDER BY clause should immediately precede the FROM clause in a SELECT statement Correct. 43. The PLAYERS table contains these columns: PLAYERS TABLE: LAST_NAME VARCHAR2 (20) FIRST_NAME VARCHAR2 (20) SALARY NUMBER(8,2) TEAM_ID NUMBER(4) MANAGER_ID NUMBER(9) POSITION_ID NUMBER(4) You want to display all players' names with position 6900 or greater. You want the players names to be displayed alphabetically by last name and then by first name. Which statement should you use to achieve the required results? Mark for Review (1) Points SELECT last_name, first_name FROM players WHERE position_id >= 6900 ORDER BY last_name, first_name;(*) SELECT last_name, first_name FROM players WHERE position_id > 6900 ORDER BY last_name, first_name; SELECT last_name, first_name FROM players WHERE position_id <= 6900 ORDER BY last_name, first_name; SELECT last_name, first_name FROM players WHERE position_id >= 6900 ORDER BY last_name DESC, first_name;

Correct. 44. Evaluate this SQL statement: SELECT e.employee_id, e.last_name, e.first_name, m.manager_id FROM employees e, employees m ORDER BY e.last_name, e.first_name WHERE e.employee_id = m.manager_id;

This statement fails when executed. Which change will correct the problem? Mark for Review (1) Points Reorder the clauses in the query. (*) Remove the table aliases in the WHERE clause. Remove the table aliases in the ORDER BY clause. Include a HAVING clause. Correct. 45. Evaluate this SELECT statement: SELECT last_name, first_name, salary FROM employees;

How will the results of this query be sorted? Mark for Review (1) Points The database will display the rows in whatever order it finds it in the database, so no particular order. (*) The results will be sorted ascending by the LAST_NAME column only. The results will be sorted ascending by LAST_NAME and FIRST_NAME only. The results will be sorted ascending by LAST_NAME, FIRST_NAME, and SALARY. Correct.

46. Evaluate this SELECT statement: SELECT last_name, first_name, email FROM employees ORDER BY email;

If the EMAIL column contains null values, which statement is true? Mark for Review (1) Points Null email values will be displayed first in the result. Null email values will be displayed last in the result. (*) Null email values will not be displayed in the result. The result will not be sorted. Correct. 47. Evaluate this SELECT statement: SELECT * FROM employees WHERE department_id = 34 OR department_id = 45 OR department_id = 67;

Which operator is the equivalent of the OR conditions used in this SELECT statement? Mark for Review (1) Points IN (*) AND LIKE BETWEEN ... AND ... Correct.

48. You query the database with this SQL statement: SELECT price FROM products WHERE price IN(1, 25, 50, 250) AND (price BETWEEN 25 AND 40 OR price > 50);

Which two values could the statement return? (Choose two.) Mark for Review (1) Points (Choose all correct answers) 1 50 25 (*) 10 250 (*) 100 Correct. 49. Evaluate this SQL statement: SELECT product_id, product_name, price FROM products ORDER BY product_name, price;

What occurs when the statement is executed? Mark for Review (1) Points The results are sorted numerically only. The results are sorted alphabetically only. The results are sorted numerically and then alphabetically. The results are sorted alphabetically and then numerically. (*)

Correct. 50. Which SELECT statement should you use to limit the display of product information to those products with a price of less than 50? Mark for Review (1) Points SELECT product_id, product_name FROM products WHERE price < 50; (*) SELECT product_id, product_name FROM products HAVING price < 50; SELECT product_id, product_name FROM products WHERE price <= 50; SELECT product_id, product_name FROM products GROUP BY price < 50; SELECT product_id, product_name FROM products WHERE price < 50.00 GROUP BY price; Correct.