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A Cardinality Constraint is when a certain relation can only have a certain number of instances for a relationship. For example, a Voter can only vote once in an election. Thus, there needs to be a cardinality constraint on the relationship VotedIn that relates a Voter to Election.

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What is Minimum and Maximum Cardinality?

Minimum and maximum cardinality refer to the constraints on the number of instances of one entity that can be associated with instances of another entity in a relational database or entity-relationship model. Minimum cardinality specifies the least number of instances required, such as "zero" (optional) or "one" (mandatory), while maximum cardinality indicates the upper limit, such as "one" (single instance) or "many" (multiple instances). Together, these concepts help define the nature of relationships between entities, ensuring that data integrity is maintained in the database design.


What is mapping cardinality?

Mapping cardinality refers to the relationship between two sets in terms of how many elements from one set are associated with elements in another set. It is commonly used in database design and entity-relationship modeling to specify the number of instances of one entity that can or must be associated with instances of another entity. Cardinality can be classified as one-to-one, one-to-many, or many-to-many, affecting how data is structured and accessed. Understanding mapping cardinality is crucial for ensuring data integrity and optimizing database performance.


Explain the steps in the design of an MIS?

1. Data collection through interview, source documents and personal observation. 2. Defining the problem in deatil. 3. Setting the system objective. 4. Establishing constraints. 5. Determining information needs and sources. 6. Develop alternative designs and select the best. 7. Documenting the conceptual design. 8. Detailed system analysis


What are some experimental design flaws that may explain why you don't get 100 percent yield?

What are some experimental design flaws that may explain why you don't get 100% yieldin the balloon lad


What are the factors for determining the sample design?

In the process of developing a sampling design for this study, there are some critical factors you should consider. Explain five of these factors.

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Could you explain the purpose of logical database design?

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What are the responsibilities of the database designer?

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i am not aware about it.if u get to know then let me know


What is database design?

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Is possible that during the physical database design and creation step of database development you might want to return to logical database design activity?

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What are the three design goals for relational databases and explain why each is desirable.?

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What are some common constraints in the field of engineer design?

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