Section 2 Quiz Oracle Database Programming with SQL

Section 2 Quiz Oracle Database Programming with SQL
Section 2 Quiz(SOLUTION)

(Answer all questions in this section)

1. Which of the following are true? (Choose Two) Mark for Review

(1) Points

(Choose all correct answers)

Character values are not case-sensitive

Date values are format-sensitive (*)

Date values are enclosed in single quotation marks (*)

Character strings are enclosed in double quotation marks

2. Which of the following would be returned by this SELECT statement:

SELECT last_name, salary

FROM employees

WHERE salary < 3500;

Mark for Review

(1) Points

LAST_NAME SALARY

King 5000

LAST_NAME SALARY

Rajas 3500

LAST_NAME SALARY

Davies 3100(*)

All of the above

3. How can you write "not equal to" in the WHERE-clause? Mark for Review

(1) Points

!=

^=

<>

All of the above (*)

4. Which query would give the following result?

LAST_NAME FIRST_NAME DEPARTMENT_ID

King Steven 90

Mark for Review

(1) Points

SELECT last_name, first_name, department_id

FROM employees

WHERE last_name LIKE 'k%';

SELECT last_name, first_name, department_id

FROM employees

WHERE last_name LIKE 'KING';

SELECT last_name, first_name, department_id

FROM employees

WHERE last_name = 'King';(*)

SELECT last_name, first_name, department_id

FROM employees C

WHERE last_name = 'KING';

5. Which SELECT statement will display both unique and non-unique combinations of the MANAGER_ID and DEPARTMENT_ID values from the EMPLOYEES table? Mark for Review

(1) Points

SELECT DISTINCT manager_id, department_id FROM employees;

SELECT manager_id, DISTINCT department_id FROM employees;

SELECT manager_id, department_id FROM employees; (*)

SELECT manager_id, department_id DISTINCT FROM employees;

6. Where in a SQL statement can you not use arithmetic operators? Mark for Review

(1) Points

WHERE

SELECT

NONE

FROM (*)

7. Which clause would you include in a SELECT statement to restrict the data returned to only the employees in department 10? Mark for Review

(1) Points

WHERE (*)

FROM

SELECT

IS

8. The concatenation operator ... Mark for Review

(1) Points

Brings together columns or character strings into other columns

Creates a resultant column that is a character expression

Is represented by two vertical bars ( || )

All of the above (*)

9. You need to display employees whose salary is in the range of 30000 and 50000. Which comparison operator should you use? Mark for Review

(1) Points

LIKE

BETWEEN...AND... (*)

IN

IS NULL

10. Which comparison condition would you use to select rows that match a character pattern? Mark for Review

(1) Points

LIKE (*)

IN

ALMOST

SIMILAR

11. Which of the following WHERE clauses would not select the number 10? Mark for Review

(1) Points

WHERE hours <= 10

WHERE hours IN (8,9,10)

WHERE hours <>10 (*)

WHERE hours BETWEEN 10 AND 20

12. When using the "LIKE" operator, the % and _ symbols can be used to do a pattern-matching, wild card search. True or False? Mark for Review

(1) Points

True (*)

False

13. Which of the following are examples of comparison operators used in the WHERE clause? Mark for Review

(1) Points

=, >, <, <=, >=, <>

between ___ and ___

in (..,..,.. )

like

is null

All of the above (*)

14. 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 (*)

15. The EMPLOYEES table contains these columns:

LAST_NAME VARCHAR2(25)

FIRST_NAME VARCHAR2(25)

EMAIL VARCHAR2(50)

You are writing a SELECT statement to retrieve the names of employees that have an email address.

SELECT last_name||', '||first_name "Employee Name"

FROM employees;

Which WHERE clause should you use to complete this statement?

Mark for Review

(1) Points

WHERE email != NULL;

WHERE email IS NOT NULL; (*)

WHERE email = NULL;

WHERE email IS NULL;

1. You need write a SELECT statement that should only return rows that contain 34, 46, or 48 for the DEPARTMENT_ID column. Which operator should you use in the WHERE clause to compare the DEPARTMENT_ID column to this specific list of values? Mark for Review

(1) Points

BETWEEN..AND..

!=

=

IN (*)

2. You want to retrieve a list of customers whose last names begin with the letters 'Fr' . Which keyword should you include in the WHERE clause of your SELECT statement to achieve the desired result? Mark for Review

(1) Points

IN

BETWEEN

AND

LIKE (*)

3. Evaluate this SELECT statement:

SELECT *

FROM employees

WHERE department_id IN(10, 20, 30)

AND salary > 20000;

Which values would cause the logical condition to return TRUE?

Mark for Review

(1) Points

DEPARTMENT_ID = 20 and SALARY = 20000

DEPARTMENT_ID = 10 and SALARY = 20000

DEPARTMENT_ID = 10 and SALARY = 20001 (*)

DEPARTMENT_ID = null and SALARY = 20001

4. How can you write "not equal to" in the WHERE-clause? Mark for Review

(1) Points

!=

^=

<>

All of the above (*)

5. Which of the following are true? (Choose Two) Mark for Review

(1) Points

(Choose all correct answers)

Date values are enclosed in single quotation marks (*)

Character strings are enclosed in double quotation marks

Date values are format-sensitive (*)

Character values are not case-sensitive

6. 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 (*)

7. The EMPLOYEES table contains these columns:

LAST_NAME VARCHAR2(25)

FIRST_NAME VARCHAR2(25)

EMAIL VARCHAR2(50)

You are writing a SELECT statement to retrieve the names of employees that have an email address.

SELECT last_name||', '||first_name "Employee Name"

FROM employees;

Which WHERE clause should you use to complete this statement?

Mark for Review

(1) Points

WHERE email IS NOT NULL; (*)

WHERE email IS NULL;

WHERE email = NULL;

WHERE email != NULL;

8. When using the "LIKE" operator, the % and _ symbols can be used to do a pattern-matching, wild card search. True or False? Mark for Review

(1) Points

True (*)

False

9. Which of the following WHERE clauses would not select the number 10? Mark for Review

(1) Points

WHERE hours <= 10

WHERE hours <>10 (*)

WHERE hours BETWEEN 10 AND 20

WHERE hours IN (8,9,10)

10. Which two statements would select salaries that are greater than or equal to 2500 and less than or equal to 3500? (Choose two) Mark for Review

(1) Points

(Choose all correct answers)

WHERE salary BETWEEN 3500 AND 2500

WHERE salary BETWEEN 2500 AND 3500 (*)

WHERE salary <=2500 AND salary >= 3500

WHERE salary >= 2500 AND salary <= 3500 (*)

11. You need to display employees with salaries that are at least 30000 or higher. Which comparison operator should you use? Mark for Review

(1) Points

"=>"

!=

>

>= (*)

12. The concatenation operator ... Mark for Review

(1) Points

Brings together columns or character strings into other columns

Creates a resultant column that is a character expression

Is represented by two vertical bars ( || )

All of the above (*)

13. You need to display employees whose salary is in the range of 30000 and 50000. Which comparison operator should you use? Mark for Review

(1) Points

BETWEEN...AND... (*)

IN

IS NULL

LIKE

14. 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

DISTINCTROW

ONLY

UNIQUEONE

DISTINCT (*)

15. You need to display employees whose salary is in the range of 10000 through 25000 for employees in department 50 . What does the WHERE clause look like? Mark for Review

(1) Points

WHERE department_id < 50

AND salary BETWEEN 10000 AND 25000

WHERE department_id = 50

AND salary BETWEEN 25001 AND 10001

WHERE department_id = 50

AND salary BETWEEN 10000 AND 25000(*)

WHERE department_id > 50

AND salary BETWEEN 10000 AND 25000