Answer Posted / lakshmi

Database normalization is a technique for designing
relational database tables to minimize duplication of
information and, in so doing, to safeguard the database
against certain types of logical or structural problems,
namely data anomalies.

For example, when multiple instances of a given piece of
information occur in a table, the possibility exists that
these instances will not be kept consistent when the data
within the table is updated, leading to a loss of data
integrity. A table that is sufficiently normalized is less
vulnerable to problems of this kind, because its structure
reflects the basic assumptions for when multiple instances
of the same information should be represented by a single
instance only.

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