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8. DATABASE DESIGN The data design transforms the information domain model created during the analysis into the data structure that will be required to implement software. Normalization Normalization is a process of simplifying the relationship between data elements in a record. Through this technique, the collection of data in a record structure is replaced by successive record structure that is simpler and more predictable and therefore more manageable. KEYS PRIMARY KEY A Primary key is one, used to identify unique value of an attribute in a table. A primary key column in a table has special attributes.
It defines the column, as a
mandatory column i.e. the column can’t be left blank. The NOT NULL attribute is active. The data held across the column must be unique. FOREIGN KEY FOREIGN KEY represents relationship between tables foreign key is a column whose values are derived from the primary key or unique key of some other table. The table in which the foreign key used is called foreign table of detail table. The table that defines the primary or unique key and is referenced by the foreign key is called the primary key in the master table. NORMALIZATION IS CARRIED FOR FOLLOWING REASONS:
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