Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Expert Solution & Answer
Chapter 2, Problem 2.19RQ
Explanation of Solution
According to the reference of book, the terms “primary key” and “foreign key” are defined as follows:
Primary key:
- Primary key is like a candidate key in which it uniquely identifies each row in a relation.
- For example consider that there is an “Employee” table in which “emp_id” is unique so it is chosen as a primary key in
database table. - In this book, primary keys are underlined.
- For example consider that there is an “Employee” table in which “emp_id” is unique so it is chosen as a primary key in
Foreign key:
- To maintain the relationship between the database tables, the values are placed from one relation to second relation.
- The values used in first relation come under the primary key values whereas the values that are referred in second relation come under the foreign key...
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
What distinguishes a primary key from a candidate key or a superkey?
How do primary key, candidate key, and superkey differ?
What use does using keys serve exactly?
Chapter 2 Solutions
Database Concepts (7th Edition)
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
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
- Explain the difference between Primary Key and Foreign Key , give examplearrow_forwardAccess path A database table is composed of records and fields hold data. Data is stored in records. A field is a part of a record and contains a single piece of data for the subject of the record. The access path for finding the list of books is AUTHOR: AuthorID, Lname BOOKAUTHOR: AuthorID, ISBN BOOKS: Pubdate, ISBNarrow_forwardUSE NORTHWIND DATABASE Write a SELECT statement using the CASE function. The statement returns two columns basedon how many orders the customer has in the database. The first column is the customer name andthe second column, Membership Type, is based on which case applies to the customer:If the customer has more than 25 orders they are a Diamond Customer.If the customer has more than 15 orders they are a Gold Customer.If the customer has more than 10 orders they are a Silver Customer.If the customer has more than 5 orders they are an Iron Customer.Otherwise the customer is a Valued Customer.arrow_forward
- A foreign key should normally have the same name as the primary key from which it was copied. Group of answer choices True Falsearrow_forwardDo what is askedarrow_forwardTable 2 stores details of doctors, patients and dates of appointments. The Primary Key is (doctorID, patientID). i. Explain why the above table is not in 2nd Normal Form. ii. Normalize the table to 3rd Normal Form.arrow_forward
- Any relation must have at least ONE Select one: a. Foreign Key b. Composite key c. Alternate key d. Candidate keyarrow_forwardC sharp Table: Student (the headers are the field names in the Students table) StudentID Name Age Gender ProgramID 791 Stephanie Brown 19 Female BCS 236 Shannon Dawn 25 Female BA 618 Geoff Berg 24 Male ARET 256 Andrew Schilling 22 Male BSC 902 Gary Sang 23 Male DAAD Note: There is a StudentDataSet with a Student table, a StudentTableAdapter, a StudentBindingSource, and a StudentDataGridView control on the form.Note: There is an Average query, named Average, that returns the average age of the student from the Student table.Note: There is also Max query, named Highest, that returns the highest age of the student from the Student table.Write the code you would place in the AverageButton click event on your form to call the Average query and the Highest query and display in a DifferenceLabel, the difference between the highest age of a student and the average age.arrow_forwardop Cancept which of the followiarrow_forward
- LAB DBI DATABASEarrow_forwardComputer Science I need help with writing the query in a SQL server Management (database) the question is what are the procedure and triggers in these descriptions? or which procedure and trigger are used for this description If the Students have English as a second language, they need to be placed in classes only reserved for them. If English is a first language, then they need to be placed into specific classes reserved for them.arrow_forwardAlternate keys: Identify at least five keys (not already listed as PK or FK) needed by end users. These indexes would be considered Alternate or Secondary keys and are mostly used for queries and quick reporting. They may contain multiple columns.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- A Guide to SQLComputer ScienceISBN:9781111527273Author:Philip J. PrattPublisher:Course Technology PtrProgramming with Microsoft Visual Basic 2017Computer ScienceISBN:9781337102124Author:Diane ZakPublisher:Cengage Learning
- Np Ms Office 365/Excel 2016 I NtermedComputer ScienceISBN:9781337508841Author:CareyPublisher:CengageProgramming Logic & Design ComprehensiveComputer ScienceISBN:9781337669405Author:FARRELLPublisher:Cengage
A Guide to SQL
Computer Science
ISBN:9781111527273
Author:Philip J. Pratt
Publisher:Course Technology Ptr
Programming with Microsoft Visual Basic 2017
Computer Science
ISBN:9781337102124
Author:Diane Zak
Publisher:Cengage Learning
Np Ms Office 365/Excel 2016 I Ntermed
Computer Science
ISBN:9781337508841
Author:Carey
Publisher:Cengage
Programming Logic & Design Comprehensive
Computer Science
ISBN:9781337669405
Author:FARRELL
Publisher:Cengage