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frosja888 [35]
3 years ago
11

For each of the descriptions below, perform the following tasks:

Computers and Technology
1 answer:
Zigmanuir [339]3 years ago
8 0

Answer:

attached below in the explanation and the diagrams attached

Explanation:

<em>question</em>

<em>i) identify the degree and cardinality of the relationship</em>

<em>ii) Express the entities and the relationships with attributes in each description graphically with an E-R diagram </em>

<u>A)</u>

i) The degree and cardinality of the relationship

  • The entities PIANO, MODEL and DESIGNER have a degree of two i.e. Binary relationship
  • The cardinality of the entities PIANO, MODEL and DESIGNER have a relationship of ONE-to-many

ii) description graphically with an E-R diagram

The E-R diagrams show that  The degree of the relationship for the entities PIANO, MODEL, and DESIGNER is two(2).  and also shows that there is a One-to-Many cardinality available in the entities PIANO, MODEL, and DESIGNER

E-R diagram Attached below

<u>B) </u> 

i) The degree and cardinality of the relationship

  • entities PIANO and Technician have a degree of two ( 2 ) ; i.e. a Binary relationship
  •  The cardinality of the entities PIANO, and TECHNICIAN have  a relationship of Many-to-Many.

ii) Graphical description with an E-R diagram

The diagram describes/ shows that, entities PIANO and Technician have a degree of two ( 2 ) ; i.e. a Binary relationship and also The cardinality of the entities PIANO, and TECHNICIAN have  a relationship of Many-to-Many.

E-R diagram attached below

<u>C) </u>

i) Degree and cardinality of the entity Technician

  •  The entity TECHNICIAN has a degree one, i.e.  a unary relationship.
  • The cardinality of the entity TECHNICIAN have the relationship of  One-to-Many.

ii) E-R diagram attached below

<u>D) </u>

i) Degree and cardinality of the relationship

  • The entities TABLET TYPE and PROCESSOR TYPE have a degree of two(2) , i.e. a binary relationship
  • The cardinality these entities TABLET TYPE, and PROCESSOR TYPE have is a Many-to-Many relationship

ii) E-R diagram attached for TABLET TYPE, PROCESSOR TYPE is attached below

<u>E) </u>

i) Degree and cardinality of the relationship

  • The entities TABLET TYPE, TABLET COMPUTER, and CUSTOMER have a degree of two(2) ; i.e. a binary relationship.
  • The cardinality these entities TABLET TYPE, TABLET COMPUTER, and CUSTOMER have is a   One-to-Many relationship

also  the shipment to the customer is multiple hence the relationship can be said to be  Many-to-Many relationship

also The attribute Shipping Date will become an attribute of that M: M relationship.

ii) The E-R diagram for TABLET TYPE, TABLET COMPUTER, CUSTOMER  is attached below

<u>F)</u>

i) Degree and cardinality of the relationship  between TABLET TYPE, TECHNICIAN

  • The entities TABLET TYPE, and TECHNICIAN have a degree of two(2); i.e.  a binary relationship.
  •  The cardinality these entities TABLET TYPE, and TECHNICIAN have is a Many-to-Many relationship

ii) E-R diagram attached below

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