- At present there are six relational database Paradigm: - first paradigm (1NF) i.e., each column of the database table are indivisible atomic data items, not a non-atomic set of data items, arrays, records. That is, when an attribute in an entity has multiple values, it must be split into different attributes. - The second paradigm (2NF) on the basis of the first paradigm, each instance of a database record or table must be uniquely distinguished. - third paradigm (3NF) on the basis of the second paradigm, requires a relationship comprising a non-primary key information is not already included in other relationships. - Bath - Cape Cod Paradigm (BCNF) amendments to the third normal form, the database redundancy smaller. - fourth normal form (4NF) - Fifth Normal (5NF, also known as the perfect paradigm)
divided paradigm means that the higher the finer table, a table in the database needs of the more, users had to originally associated The data is divided into multiple tables. When users need these data at the same time, they can only merge the data together in the form of a connection table.