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(solution) I need you to fix the cardinalities in this one also. I gave you


I need you to fix the cardinalities in this one also.  I gave you an example in the header of the document just to remind you. But i only need the cardinalities of minimum and maximum for the diagram attached as examhelpnew1


Same format as you did in this one. For this one. The fixed one would be the ones you just did that is perfect. The other document is the one where I need the diagram for the dogs. I need the cardinalities for this one to be just like the one you just fixed. 


ANSWER A.

 

Minimum Cardinalities in the diagram

 

?

 

?

 

?

 

?

 

?

 

?

 

?

 

? SERVICE is not required for SERVICE_TYPE

 

SERVICE must have a SERVICE_TYPE.

 

SERVICE must have an EMPLOYEE.

 

SERVICE is not required for EMPLOYEE.

 

CUSTOMER must have a SERVICE.

 

SERVICE must have a CUSTOMER.

 

CUST_ALIAS is not required CUSTOMER

 

CUST_ALIAS must have a CUSTOMER ANSWER B.

 

Referential Integrity Constraint of Recursive Relationship

 

Referred By column of Customer table has a referential integrity constraint with

 

CustomerID of the same table. It is the Foreign Key which is related to the Primary Key of

 

the same table. In other words, the constraint would restrict the value of Referred By

 

column to only those values which already exists in the table as CustomerID. ANSWER C.

 

Maximum Cardinalities in the diagram

 

?

 

?

 

?

 

?

 

?

 

?

 

?

 

? SERVICE_TYPE can be used by many SERVICE

 

SERVICE can have one SERVICE_TYPE

 

SERVICE can have one EMPLOYEE

 

EMPLOYEE can have many SERVICE

 

CUSTOMER can have many SERVICE

 

SERVICE can be of one CUSTOMER

 

CUSTOMER can have many CUST_ALIAS

 

CUST_ALIAS can have one CUSTOMER

 


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Sep 13, 2020

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