Under what circumstances can an attribute of a relation be of variable length?
Q: What are the conditions under which an attribute of a relation may have a changeable length?
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Under what circumstances can an attribute of a relation be of variable length?
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- How does the primary key of a relation relate to the interdependencies among its other attributes from a practical standpoint?What are three indications that a surrogate key should be constructed for the primary key of a relation?Describe three situations in which a substitute key for the main key of a relation should be produced.
- How does the primary key of a relation relate to the interdependencies of its characteristics from a functional standpoint?explanation of three situations in which a relation's secondary key should be set in place of the primary keyTrue or False: Every primary key of a relation is a superkey No hand written and fast answer with explanation