What is a third normal form?
Q: What is a third normal form?
A: Third normal form (3NF) is a property of a relational model and a criterion of database normalization.
Q: What is the first requirement for a table to be considered in third normal form?
A: The first requirement for a table to be considered in third normal form is that it must already be in second normal form.
Q: What does it mean for data in a column to be dependent only on columns that are part of the primary key?
A: It means that the data in each column in each row are dependent only on other columns that are part of the primary key.
Q: Can there be columns in a table that are not related to any column in the primary key?
A: Columns that are not related to any column in the primary key are removed.
Q: What is the function of a primary key in a table?
A: A primary key is one or more columns in a row that is used to identify and index that row of the table.
Q: How is a third normal form beneficial to database normalization?
A: Being in third normal form makes it easier to maintain and update the database, as well as reduce redundancy and improve consistency in the data.
Q: What is the relationship between second normal form and third normal form?
A: The first requirement for a table to be considered in third normal form is that it must already be in second normal form. Therefore, second normal form is a necessary requirement for a table to be in third normal form.
