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Explain what is meant by repetition of information and
inability to represent information. Explain why each of
these properties may indicate a bad relational database
design.
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Answer Posted / shrikant patil
Repetition of Information is a condition in a relational
database where the values of one attribute are determined by
the values of another attribute in the same relation, and
both values are repeated throughout the relation. This is a
bad relational database design because it increases the
storage required for the relation and it makes updating the
relation more difficult.
- Inability to represent information is a condition where a
relationship exists among only a proper subset of the
attributes in a relation. This is bad relational database
design because all the unrelated attributes must be filled
with null values otherwise a tuple without the unrelated
information cannot be inserted into the relation.
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