What is Dr. Codd’s relational model and what does it include
What is Dr. Codd’s relational model and what does it include
Contrast the terms relation, tuple, and attribute with table, row, and column.
Describe the relationship between a superkey, a candidate key, and a primary key. Give an example.
Explain where you can use business rules in an organization
Describe and give an example of one of the following:
– derived attribute
– multivalued attribute
– ternary relationship
– required attribute
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Explain using an example for each
Derived attribute
This is a category of attributes that are calculated and derive from another existing attribute. A derived attribute is not stored in the database but it is calculated and derived through algorithm. Calculating these attributes is easy because the information required in deriving these attributes is available on the database. On a diagram used for presentation such attributes are represented using dotted lines. A derived attribute can be calculated from different entities in a given model (Sumathi, and Esakkirajan, 2007). These…
APA
671 words
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