Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Chapter 2, Problem 2.37RQ
Program Plan Intro
Modification Problem:
A modification problem contains a circumstance where a value already exists in a
Functional dependencies:
The functional dependency is a relationship that exists at the time of one attribute distinctively determines another.
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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
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- What are three advantages of using a surrogate key rather than the main key to access a relation instead?arrow_forwardWhat three situations make it necessary to make a substitute key instead of the main key of a relation?arrow_forwardExplain the concept of functional dependencies and how they relate to normalization.arrow_forward
- The properties of the relation object can be used to implement the master-detail functionality which most appropriate for your application. You can delete a master-detail relation by selecting it in the Object Navigator and choosing Navigator => Delete. Discuss the Deletion of Relations in detail.arrow_forwardWhat is the link between a relation's main key and the functional dependencies among all of its attributes?arrow_forwardSabir and Sons Company were doing very well before the COVID pandemic took over all the World. The employees usually had to make business tours all across the globe. Following is the Table schema of their tours made before COVID-19: Tour ( Tour_ID, Begin_Date, End_Date, Stayed_Countries, Used_Cards) You are required to create sample (mock-up/dummy) data records of the above relation. This way every student should have separate data. Then create the Functional Dependencies and normalize the relations step by step up to BCNF. (Hint: Neat and Clean Work with proper demonstration gets you good marks)arrow_forward
- Given the relation R(A, B, C, D, E, F), the following functional dependencies exist: B --> C, DD --> F a) What normal form is the relation R in? b) Normalize relation R to 3NF. You only need to show the final relation schemasarrow_forwardCreate a form of the hybrid merge-join method that is appropriate for the situation in which both relations are not physically sorted, but both have a sorted secondary index on the attributes that are to be combined.arrow_forwardIf you assume that a relation has no duplicate data, how do you know there is always at least one primary key?arrow_forward
- What is a well-structured relation?arrow_forwardDescribe three circumstances when a surrogate key for the primary key of a relation should be created.arrow_forwarddatabase Assume that you have the following relation; R(a,b,c) a b c ---------- 1 A F 2 B M 3 T F 4 R M 5 A F And S is a relation with one attribute called c and has one tuple with the value 'F". Then the cardinality of R divided by S will be = ----- Select one: a. Non of the mentioned b. 2 c. 1 d. 3arrow_forward
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