UNIT6.pptx - UNIT VI NORMALIZATION WHAT IS NORMALIZATION • • • Normalization is a process in which we systematically examine relations for

UNIT6.pptx - UNIT VI NORMALIZATION WHAT IS NORMALIZATION...

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UNIT VI NORMALIZATION
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WHAT IS NORMALIZATION? Normalization is a process in which we systematically examine relations for anomalies and, when detected, remove those anomalies by splitting up the relation into two new, related, relations. Often during normalization, the database designers get their first real look into how the data are going to interact in the database. Normalizing a relation reduces data redundancy but introduces the need for joins when all of the data is required by an application such as a report query.
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WHAT IS NORMALIZATION? Each attribute (column) value must be a single value only. All values for a given attribute (column ) must be of the same data type. Each attribute (column) name must be unique. The order of attributes (columns) is insignificant No two tuples (rows) in a relation can be identical. The order of the tuples (rows) is insignificant.
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FORMAL DESIGN GUIDELINES FUNCTIONAL DEPENDENCY (FD) - a constraint between two sets of attributes from the database. It describes a relationship between
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  • Marlon naagas

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