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PDF Editor FAQ
What is the difference between NF, 2NF, and 3NF?
First Normal Form (1NF)First Normal Form (1NF) sets the very basic rules for an organized database as follows:Eliminate duplicate columns from the same table.Create separate tables for each group of related data and identify each row by using a unique column or set of columns (i.e., primary key).Second Normal Form (2NF)Second Normal Form (2NF) further addresses the concept of removing duplicate data as follows:Meet all the requirements of the First Normal Form.Remove subsets of data that apply to multiple rows of a table and place them in separate tables.Create relationships between these new tables and their predecessors through the use of foreign keysThird Normal Form (3NF)Third normal form (3NF) goes one step further as follows:Meet all the requirements of the Second Normal Form.Remove columns that are not dependent upon the primary key.
What is the distinction between BCNF and 3NF? Is there a reason to prefer one over the other?
3NF is the Third normal form used in relational database normalization. According to the Codd’s definition, a table is said to be in 3NF, if and only if, that table is in the second normal form (2NF), and every attribute in the table that do not belong to a candidate key should directly depend on every candidate key of that table.BCNF (also known as 3.5NF) is another normal form used in relational database normalization. It was introduced to capture some the anomalies that are not addressed by the 3NF. A table is said to be in BCNF, if and only if, for each of the dependencies of the form A → B that are non-trivial, A is a super-key.
What does it mean to say that a database table is in third normal form (3NF)?
Before Studying 3NF You should know "What is Normalization ?" then You will go for Types of Normal FormNormalization :It is the process of minimizing redundancy from a relation or set of relations. Redundancy in relation may cause insertion, deletion and Updation anomalies. So, it helps to minimize the redundancy in relations. Normal forms are used to eliminate or reduce redundancy in database tables.Types Of Normal Forms1NF : A relation is in 1NF if it contains an atomic value.2NF : A relation will be in 2NF if it is in 1NF and all non-key attributes are fully functional dependent on the primary key.3NF : A relation will be in 3NF if it is in 2NF and no transition dependency exists.BCNF : For a table to satisfy the Boyce-Codd Normal Form, it should satisfy the following two conditions:It should be in the Third Normal Form.And, for any dependency A → B, A should be a super key.The second point sounds a bit tricky, right? In simple words, it means, that for a dependency A → B, A cannot be a non-prime attribute, if B is a prime attribute.For More Information Check the popular website of Normalization
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