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What is superkey?
it is a set one or more attribute,that taken collectively allow as to idendify uniquly and entity in entity set. ex-customer-id,
What is the difference between a number and a constant?
Constant is referred to numbers that stay the same, particularly in experiment/studies. A number is any form of entity that is counted. For example, 5, 3 billion....etc...
What is the connection between Satan and Damien?
Satan is an evil entity and the name Damien is a satanic name used by the occult.
What field makes the best primary key?
The field or combination of fields, the latter is called a composite key, which uniquely identifies a record. Often people use an integer automatically assigned at record creation, however, if possible it is best, to try for a field which is a unique attribute of the entity a table is describing.
What is the definition for rate of change?
If an entiry is dependent on another entity in a certain way then the change in value of the dependent entity to an unit change in the value of the independent entity is the rate of change.
