EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133777840
Author: AUER
Publisher: VST
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 2, Problem 2.22RQ
Give an example of a null value (other than one from this chapter), and explain each of the three possible interpretations for that value.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Give an example of a null value and
Explain each of the three possible interpretations for that value.
What exactly are nulls? Which field is not capable of accepting null values? Why?
Define the term Null?
Chapter 2 Solutions
EBK DATABASE CONCEPTS
Ch. 2 - Prob. 2.1RQCh. 2 - Define the term entity, and give an example of an...Ch. 2 - Prob. 2.3RQCh. 2 - Prob. 2.4RQCh. 2 - Prob. 2.5RQCh. 2 - Prob. 2.6RQCh. 2 - Prob. 2.7RQCh. 2 - Prob. 2.8RQCh. 2 - Prob. 2.9RQCh. 2 - Define the term unique key and give an example.
Ch. 2 - Prob. 2.11RQCh. 2 - Prob. 2.12RQCh. 2 - Prob. 2.13RQCh. 2 - Describe four uses of a primary key.Ch. 2 - Prob. 2.15RQCh. 2 - Prob. 2.16RQCh. 2 - Prob. 2.17RQCh. 2 - Explain the term foreign key, and give an example.Ch. 2 - Prob. 2.19RQCh. 2 - Prob. 2.20RQCh. 2 - Explain three possible interpretations of a null...Ch. 2 - Give an example of a null value (other than one...Ch. 2 - Prob. 2.23RQCh. 2 - Prob. 2.24RQCh. 2 - Prob. 2.25RQCh. 2 - Prob. 2.26RQCh. 2 - Prob. 2.27RQCh. 2 - Define the term primary key in terms of functional...Ch. 2 - Prob. 2.31RQCh. 2 - Examine the data in the Veterinary Office...Ch. 2 - Prob. 2.33RQCh. 2 - Describe a modification problem that occurs when...Ch. 2 - Prob. 2.35RQCh. 2 - Prob. 2.36RQCh. 2 - Prob. 2.37RQCh. 2 - Apply the normalization process to the Veterinary...Ch. 2 - Prob. 2.39ECh. 2 - Prob. 2.40E
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
Write a program that finds the temperature that is the same in both Celsius and Fahrenheit. The formula to conv...
Problem Solving with C++ (9th Edition)
The ________ object is assumed to exist and it is not necessary to include it as an object when referring to it...
Web Development and Design Foundations with HTML5 (8th Edition)
_____ is data the computer collects from the world outside of the computer.
Starting Out With Visual Basic (7th Edition)
Repeat Programming Project 11 from Chapter 10 but use an array to store the movie ratings instead of separate v...
Problem Solving with C++ (10th Edition)
The ____________ is always transparent.
Web Development and Design Foundations with HTML5 (9th Edition) (What's New in Computer Science)
Write a definition of a method isEmpty for the class StringLinkedList that returns true if the list is empty, t...
Java: An Introduction to Problem Solving and Programming (8th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- Do we consider NULL values the same as that of blank space or zero in databases?arrow_forwardAnswer the given question with a proper explanation and step-by-step solution. sid name value working hours timestamp 14 temperatureΑΒΒ 47 20 11/10/22015 12:00:00 16 humidityBosch 51 200 11/11/22015 12:00:00 19 temperatureΑΒΒ 41 NULL 11/11/22015 12:00:00 20 temperatureΑΒΒ NULL 30 11/12/22015 12:00:00 Write sql statement that calculates the average temperature for the temperature sensor and it will be showed Write sql statement that will show all the fields of of the table in order not to have duplex values THE NULLS VALUES MUST BE EXCLUDED . PLEASE WRITE THE ANSWER IN PAPERarrow_forwardHow carefully should even the easiest case be looked at?arrow_forward
- Damon Davis was creating the Drano Plumbing Company's spreadsheet. He determined that the net income would be $50,000. When he tallied the columns on the Balance Sheet, the totals were as follows: debit, $400,000; and credit, $300,000. What was the most likely reason for this discrepancy? If this was not the case, how should he proceed to determine the source of the error?arrow_forwardTesting SQL queries: To test if a query specified in English has been correctlywritten in SQL, the SQL query is typically executed on multiple test databases,and a human checks if the SQL query result on each test database matches theintention of the specification in English. When creating test databases, it is important to create tuples with null values for foreign-key attributes, provided the attribute is nullable (SQL allows foreign-key attributes to take on null values, as long as they are not part of the primary key and have not been declared as not null). Explain why, using an example query on the university database.arrow_forwardBy using this table answer this question: Write ONE SQL statement which uses the SUBSTR function (as many times as you need to) to extract the following three words: ‘I’, ‘am’, ‘here’ from the string ‘Where am I?’ and put the three words together using a combination of the CONCAT function and the ||. E.g. The starting string used in the SQL statement is: ‘Where am I?’ The output of the SQL statement after we run it will be: TRANS ---------- I am herearrow_forward
- Create a truth table for “Some of these kids are rude. Jimmy is one of these kids. Therefore, Jimmy is rude!”arrow_forwardSend me correct and original answer from your knowledge but if you'll copy the i'll mark multiple dislikesarrow_forwardChoose only one answer as well as state their reasons/rationale for the answer chosen. 2) A control that checks whether only numeric data is entered in the quantity ordered attribute is called a(n):a. Compatibility testb. Numeric testc. Field checkd. Validity checke. Check digit verificationarrow_forward
- Write a VALID and an INVALID data for each validity check and its field being checked given in the table. Give your own example (la, lb, 2a, 3a, 3b, 3c, 3d, 4a, 4b) S.No. Validity Check Field being Valid Data Invalid Data checked Student Name Postal Code Date Joined Date of Birth PhoneNumber la. lb Alphabetic Check Numeric Check 1. 2a. 2b 3a. 3b. Consistency Check 3d. 3c. 4b 4a. 4. |Completeness Checkarrow_forwardWhat do we mean by "full and consistent" when we declare that criteria must be met?arrow_forwardAnswer the given question with a proper explanation and step-by-step solution. 4.techniques can be used to reduce the number of values for a given continuous attribute, by dividing the range of the attribute into intervals.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill EducationStarting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSONDigital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
- C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSONDatabase Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage LearningProgrammable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education
Database System Concepts
Computer Science
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:9780134444321
Author:Tony Gaddis
Publisher:PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:9780132737968
Author:Thomas L. Floyd
Publisher:PEARSON
C How to Program (8th Edition)
Computer Science
ISBN:9780133976892
Author:Paul J. Deitel, Harvey Deitel
Publisher:PEARSON
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781337627900
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Programmable Logic Controllers
Computer Science
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education
How to Design DB Tables for any Application? (The Basics); Author: Studytonight;https://www.youtube.com/watch?v=XUdNVaSikqY;License: Standard YouTube License, CC-BY
Create a Table (Introduction to Oracle SQL); Author: Database Star;https://www.youtube.com/watch?v=BiV1IrzB1sY;License: Standard Youtube License