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Can we delete data element, which is being used by table fields. No we cant delete data element.
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
XYZ is a large chain of home entertainment rental over 100 stores distributed over all states in Australia. XYZ lends entertainment products such as movies, TV shows and games on v
For each 1: n relationship type R involving two entities E1 and E2, we recognize the entity type (say E1) at the n-side of the relationship type R and contain primary key of the en
examples of fields in a database
What is primary Key Explain? Primary Key - Primary key is one of the candidate keys. It should be selected such in which its attribute values are never, or very rarely, chang
What does authentication refer? Authentication refers to the task of verifying the uniqueness of a person.
Consider a systems development project with the following data Activity Duration (weeks) Precedence Relationship 1. Software design
What is Functional Dependency? A Functional dependency is shown by X Y among two sets of attributes X and Y that are subsets of R specifies a constraint on the possible tuple
multiplicity constarin
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