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Recent questions tagged database-design
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DBMS -- Book Confusion
which is best book for DBMS korth or navathe ? since i know that both book is great but i wanted to follow 1 particular book that is easy to understand and simple language for all topics. please suggest .
ykrishnay
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Databases
Sep 6, 2022
by
ykrishnay
544
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databases
self-doubt
database-design
rdbms
2
votes
1
answer
2
GATE ACADEMY TEST SERIES
Under a relational database if table A has a foreign key constraint referencing to another table B, then Each tuple in A is related to zero or one tuple of B. Each tuple in A is related to exactly one tuple of B. Each tuple of A is related to zero or more tuple of B. None of these.
LRU
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Sep 28, 2021
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LRU
317
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database-design
test-series
relational-model
0
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3
UGC NET CSE | December 2005 | Part 2 | Question: 18
In a relational schema, each tuple is divided in fields called : Relations Domains Queries All the above
go_editor
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Databases
Mar 27, 2020
by
go_editor
233
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ugcnetcse-dec2005-paper2
databases
database-design
1
vote
2
answers
4
UGC NET CSE | January 2017 | Part 2 | Question: 16
An attribute $A$ of datatype varchar $(20)$ has value 'Ram' and the attribute $B$ of datatype char $(20)$ has value 'Sita' in oracle. The attribute $A$ has ________ memory spaces and $B$ has _______ memory spaces. $20,20$ $3,20$ $3,4$ $20,4$
go_editor
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Databases
Mar 24, 2020
by
go_editor
1.2k
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ugcnetjan2017ii
databases
database-design
0
votes
1
answer
5
DBMS Korth Edition 6 Exercise 7 Question 29 (Page No. 321)
Explain the distinction between total and partial constraints.
ajaysoni1924
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Databases
Mar 28, 2019
by
ajaysoni1924
805
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databases
korth-edition6
database-design
er-diagram
descriptive
0
votes
1
answer
6
DBMS Korth Edition 6 Exercise 7 Question 28 (Page No. 321)
Explain the distinction between disjoint and overlapping constraints.
ajaysoni1924
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Databases
Mar 28, 2019
by
ajaysoni1924
832
views
databases
korth-edition6
database-design
er-diagram
descriptive
2
votes
0
answers
7
DBMS Korth Edition 6 Exercise 7 Question 27 (Page No. 321)
Explain the distinction between condition-defined and user-defined constraints. Which of these constraints can the system check automatically? Explain your answer.
ajaysoni1924
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Databases
Mar 28, 2019
by
ajaysoni1924
541
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korth-edition6
database-design
er-diagram
descriptive
5
votes
0
answers
8
DBMS Korth Edition 6 Exercise 7 Question 26 (Page No. 321)
Design a generalization-specialization hierarchy for a motor vehicle sales company. The company sells motorcycles, passenger cars, vans, and buses. Justify your placement of attributes at each level of the hierarchy. Explain why they should not be placed at a higher or lower level.
ajaysoni1924
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Mar 28, 2019
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ajaysoni1924
2.0k
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databases
korth-edition6
database-design
er-diagram
descriptive
2
votes
0
answers
9
DBMS Korth Edition 6 Exercise 7 Question 23 (Page No. 320)
Design a database for an airline. The database must keep track of customers and their reservations, flights and their status, seat assignments on individual flights, and the schedule and routing of future flights. Your design ... , a set of relational schemas, and a list of constraints, including primary-key and foreign-key constraints.
ajaysoni1924
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Databases
Mar 28, 2019
by
ajaysoni1924
836
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databases
korth-edition6
database-design
er-diagram
0
votes
0
answers
10
DBMS Korth Edition 6 Exercise 7 Question 22 (Page No. 319-320)
Design a database for a worldwide package delivery company (e.g., DHL or FedEx). The database must be able to keep track of customers (who ship items) and customers (who receive items); some customers may do both. ... E-R diagram, a set of relational schemas, and a list of constraints, including primary-key and foreign-key constraints.
ajaysoni1924
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Mar 28, 2019
by
ajaysoni1924
1.6k
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korth-edition6
er-diagram
database-design
4
votes
0
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11
DBMS Korth Edition 6 Exercise 7 Question 21 (Page No. 319)
Design a database for an automobile company to provide to its dealers to assist them in maintaining customer records and dealer inventory and to assist sales staff in ordering cars. Each vehicle is identified by a vehicle ... , a set of relational schemas, and a list of constraints, including primary-key and foreign-key constraints.
ajaysoni1924
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Databases
Mar 28, 2019
by
ajaysoni1924
1.5k
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korth-edition6
database-design
er-diagram
4
votes
0
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12
DBMS Korth Edition 6 Exercise 7 Question 20 (Page No. 319-320)
Consider the E-R diagram in Figure given below, which models an online bookstore. a. List the entity sets and their primary keys. b. Suppose the bookstore adds Blu-ray discs and downloadable videos to its collection. ... model the case where a shopping basket may contain any combination of books, Blu-ray discs, or downloadable video.
ajaysoni1924
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Databases
Mar 28, 2019
by
ajaysoni1924
3.0k
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databases
korth-edition6
database-design
er-diagram
descriptive
1
vote
0
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13
DBMS Korth Edition 6 Exercise 7 Question 19 (Page No. 319)
We can convert any weak entity set to a strong entity set by simply adding appropriate attributes. Why, then, do we have weak entity sets?
ajaysoni1924
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in
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Mar 28, 2019
by
ajaysoni1924
413
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databases
korth-edition6
database-design
er-diagram
descriptive
0
votes
1
answer
14
DBMS Korth Edition 6 Exercise 7 Question 18 (Page No. 319)
Explain the difference between a weak and a strong entity set.
ajaysoni1924
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in
Databases
Mar 28, 2019
by
ajaysoni1924
435
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databases
korth-edition6
database-design
er-diagram
descriptive
–1
vote
1
answer
15
DBMS Korth Edition 6 Exercise 7 Question 15 (Page No. 319)
Construct an E-R diagram for a hospital with a set of patients and a set of medical doctors. Associate with each patient a log of the various tests and examinations conducted.
ajaysoni1924
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Mar 28, 2019
by
ajaysoni1924
714
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databases
korth-edition6
database-design
er-diagram
2
votes
2
answers
16
DBMS Korth Edition 6 Exercise 7 Question 14 (Page No. 318)
Explain the distinctions among the terms primary key, candidate key, and superkey.
ajaysoni1924
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Databases
Mar 28, 2019
by
ajaysoni1924
1.5k
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databases
korth-edition6
database-design
er-diagram
descriptive
2
votes
1
answer
17
DBMS Korth Edition 6 Exercise 7 Question 13 (Page No. 318)
Temporal changes: An E-R diagram usually models the state of an enterprise at a point in time. Suppose we wish to track temporal changes, that is, changes to data over time. For example, Zhang may have been a student between ... , with the above extensions to track temporal changes. b. Convert the above E-R diagram into a set of relations.
ajaysoni1924
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Databases
Mar 28, 2019
by
ajaysoni1924
607
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databases
korth-edition6
database-design
er-diagram
1
vote
0
answers
18
DBMS Korth Edition 6 Exercise 7 Question 12 (Page No. 317-318)
Figure shows a lattice structure of generalization and specialization (attributes not shown). For entity sets A, B, and C, explain how attributes are inherited from the higher-level entity sets X and Y. Discuss how to handle a case where an attribute of X has the same name as some attribute of Y.
ajaysoni1924
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Mar 28, 2019
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ajaysoni1924
522
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korth-edition6
database-design
er-diagram
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0
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0
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19
DBMS Korth Edition 6 Exercise 7 Question 11 (Page No. 317)
In SQL, foreign key constraints can only reference the primary key attributes of the referenced relation, or other attributes declared to be a super key using the unique constraint. As a result, total participation constraints on a ... 4.4.7 of korth). (Unfortunately, these features are not supported on any widely used database currently.)
ajaysoni1924
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Databases
Mar 28, 2019
by
ajaysoni1924
758
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databases
korth-edition6
database-design
er-diagram
descriptive
4
votes
0
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20
DBMS Korth Edition 6 Exercise 7 Question 10 (Page No. 317)
Consider a many-to-one relationship R between entity sets A and B. Suppose the relation created from R is combined with the relation created from A. In SQL, attributes participating in a foreign key constraint can be null. Explain how a constraint on total participation of A in R can be enforced using not null constraints in SQL.
ajaysoni1924
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Databases
Mar 28, 2019
by
ajaysoni1924
649
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databases
korth-edition6
database-design
er-diagram
descriptive
0
votes
0
answers
21
DBMS Korth Edition 6 Exercise 7 Question 9 (Page No. 317)
Suppose the advisor relationship was one-to-one. What extra constraints are required on the relation advisor to ensure that the one-to-one cardinality constraint is enforced?
ajaysoni1924
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in
Databases
Mar 28, 2019
by
ajaysoni1924
310
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databases
korth-edition6
database-design
er-diagram
descriptive
0
votes
0
answers
22
DBMS Korth Edition 6 Exercise 7 Question 8 (Page No. 317)
Consider a relation such as sec_course, generated from a many-to-one relationship sec_course. Do the primary and foreign key constraints created on the relation enforce the many-to-one cardinality constraint? Explain why.
ajaysoni1924
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Mar 28, 2019
by
ajaysoni1924
272
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databases
korth-edition6
database-design
er-diagram
descriptive
2
votes
0
answers
23
DBMS Korth Edition 6 Exercise 7 Question 7 (Page No. 317)
A weak entity set can always be made into a strong entity set by adding to its attributes the primary-key attributes of its identifying entity set. Outline what sort of redundancy will result if we do so.
ajaysoni1924
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Databases
Mar 28, 2019
by
ajaysoni1924
1.1k
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database-design
er-diagram
descriptive
0
votes
0
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24
DBMS Korth Edition 6 Exercise 7 Question 6 (Page No. 316-317)
Consider the representation of a ternary relationship using binary relationships as described in this book and illustrated in Figure (b) (attributes not shown) a. Show a simple instance of E, A, B,C, RA, RB, and RC that cannot correspond ... for E. Show how to treat E as a weak entity set so that a primary-key attribute is not required.
ajaysoni1924
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in
Databases
Mar 28, 2019
by
ajaysoni1924
568
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databases
korth-edition6
database-design
er-diagram
1
vote
0
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25
DBMS Korth Edition 6 Exercise 7 Question 5 (Page No. 316)
An E-R diagram can be viewed as a graph. What do the following mean in terms of the structure of an enterprise schema? a. The graph is disconnected. b. The graph has a cycle.
ajaysoni1924
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Databases
Mar 28, 2019
by
ajaysoni1924
552
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databases
korth-edition6
database-design
er-diagram
1
vote
0
answers
26
DBMS Korth Edition 6 Exercise 7 Question 4 (Page No. 316)
Consider an E-R diagram in which the same entity set appears several times, with its attributes repeated in more than one occurrence. Why is allowing this redundancy a bad practice that one should avoid?
ajaysoni1924
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in
Databases
Mar 28, 2019
by
ajaysoni1924
368
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databases
korth-edition6
database-design
er-diagram
0
votes
0
answers
27
DBMS Korth Edition 6 Exercise 7 Question 3,17 (Page No. 316-319)
Design an E-R diagram for keeping track of the exploits of your favorite sports team. You should store the matches played, the scores in each match, the players in each match, and individual player statistics for each match. ... . b)Extend the E-R diagram of above exercise to track the same information for all teams in a league.
ajaysoni1924
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Mar 28, 2019
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ajaysoni1924
917
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korth-edition6
database-design
er-diagram
0
votes
0
answers
28
DBMS Korth Edition 6 Exercise 7 Question 2 (Page No. 315)
Consider a database used to record the marks that students get in different exams of different course offerings (sections). a. Construct an E-R diagram that models exams as entities, and uses a ternary relationship, for the ... a particular student and section pair, yet you can represent the marks that a student gets in different exams.
ajaysoni1924
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in
Databases
Mar 28, 2019
by
ajaysoni1924
360
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databases
korth-edition6
database-design
er-diagram
0
votes
0
answers
29
DBMS Korth Edition 6 Exercise 7 Question 1 (Page No. 316)
Construct an E-R diagram for a car insurance company whose customers own one or more cars each. Each car has associated with it zero to any number of recorded accidents. Each insurance policy covers one or more cars and has one ... is for a particular period of time and has an associated due date, and the date when the payment was received.
ajaysoni1924
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Databases
Mar 28, 2019
by
ajaysoni1924
686
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databases
korth-edition6
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