Consider the following entity relationship diagram (ERD). where two entities E1 and E2 have a relation R of cardinality 1: m.mE1E2The attributes of E1 are A11, A12 and A13 where A11 is the key attribute. The attributes of E2 are A21, A22 and A23 where A21 is the key attribute and A23 is a multi-valued attribute. Relation R does not have any attribute. A relational database containing minimum number of tables with each table satisfying the requirements ofthe third normal form (3NF is designed from the above ERD. The number of tables in the database isR. Let E, and Ez be two entities in an E/R diagram with simple single-valued attributes. R, and R2 are two relationships between E, and Ez, where R, is one-to-many andR2 is many-to-many. R, and R2 do not have any attributes of their own. What is the minimum number of tables required to represent this situation in the relationalmodel?A 2B 3D 5Question 13Consider the entities 'hotel room', and 'person' with a many to many relationship 'lodging' as shown below:Hotel RoomLodgingPersonIf we wish to store information about the rent payment to be made by person (s)occupying different hotel rooms, then this information should appear as an attribute of

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Consider the following entity relationship diagram (ERD). where two entities E1 and E2 have a relation R of cardinality 1 m. m E1 R E2 The attributes of E1 are A11, A12 and A13 where A11 is the key attribute. The attributes of E2 are A21, A22 and A23 where A21 is the key attribute and A23 is a multi- valued attribute. Relation R does not have any attribute. A relational database containing minimum number of tables with each table satisfying the requirements of the third normal form (3NF) is designed from the above ERD. The number of tables in the database is

Consider the following entity relationship diagram (ERD). where two entities E1 and E2 have a relation R of cardinality 1 m. m E1 R E2 The attributes of E1 are A11, A12 and A13 where A11 is the key attribute. The attributes of E2 are A21, A22 and A23 where A21 is the key attribute and A23 is a multi- valued attribute. Relation R does not have any attribute. A relational database containing minimum number of tables with each table satisfying the requirements of the third normal form (3NF) is designed from the above ERD. The number of tables in the database is

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.

Question

Consider the following entity relationship diagram (ERD). where two entities E1 and E2 have a relation R of cardinality 1: m.
m
E1
E2
The attributes of E1 are A11, A12 and A13 where A11 is the key attribute. The attributes of E2 are A21, A22 and A23 where A21 is the key attribute and A23 is a multi-
valued attribute. Relation R does not have any attribute. A relational database containing minimum number of tables with each table satisfying the requirements of
the third normal form (3NF is designed from the above ERD. The number of tables in the database is
R.

Let E, and Ez be two entities in an E/R diagram with simple single-valued attributes. R, and R2 are two relationships between E, and Ez, where R, is one-to-many and
R2 is many-to-many. R, and R2 do not have any attributes of their own. What is the minimum number of tables required to represent this situation in the relational
model?
A 2
B 3
D 5
Question 13
Consider the entities 'hotel room', and 'person' with a many to many relationship 'lodging' as shown below:
Hotel Room
Lodging
Person
If we wish to store information about the rent payment to be made by person (s)
occupying different hotel rooms, then this information should appear as an attribute of

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When is it necessary to represent a many-to-many connection using an associated entity?
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Please help me complete the following questions
Transform an entity-relationship (E-R) diagraminto an equivalent set of well-structured(normalized) relations.
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