EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133777840
Author: AUER
Publisher: VST
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Chapter 2, Problem 2.34RQ
Describe a modification problem that occurs when changing data in the relation in question 2.32 and a second modification problem that occurs when deleting data in this relation.
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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
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- Under what circumstances can a relation have duplicate rows?arrow_forwardThe following functional dependencies describe a relation that is in 3NF.Book_ID -> Genre_ID, Genre_TypeGenre_ID -> Genre_Type True or False? Thanks.arrow_forwardNormalization functional dependencies have what characteristics?arrow_forward
- An suitable hybrid merge-join technique should be created for the case when both relations are not physically sorted but both have an index on the attributes that are being merged.arrow_forwardWhat features do normalization procedures that use functional dependencies have?arrow_forwardWhat three situations make it necessary to make a substitute key instead of the main key of a relation?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_forwardWhat is a well-structured relation?arrow_forwardWhat are three advantages of using a surrogate key rather than the main key to access a relation instead?arrow_forward
- 100. When the foreign key refers to a tuple which does not exists in subjected relation then the constraint violated is a. modify integrity b. referential integrity c. inferential integrity d. insert integrityarrow_forwardPlease written by computer source The following relation is an extract from a restaurant point-of-sale (POS) system. The system assigns a globally unique id (GUID) to every transaction processed. CheckID comes from the pre-printed check number on the ticket used by the server for the order; these pre-printed tickets are guaranteed to be unique within the restaurant. RegisterID is which register was used for checkout and the date and time of the checkout – to the minute – are recorded in CheckoutDT; assume no two checkouts can occur at the same register in the same minute. PayType and PayTotal are, respectively, how the check was paid and what the total payment was; assume there is no splitting of a check among multiple payments. When answering the questions below use the format [attribute, attribute, …, attribute] to identify keys. 1. How many keys in general (including the empty or null key) are there in this relation? 2. Identity two multi-keys for this relation. 3. Identify two…arrow_forwardThe number of tuples in a relation is referred to asarrow_forward
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