What is Second Normal Form (2NF)?
Q: What is Second Normal Form (2NF)?
A: Second Normal Form (2NF) is a property of a relational model, specifically tables that is a criterion of database normalization.
Q: What is the first criterion for a table to be considered in second normal form?
A: The first criterion for a table to be considered in second normal form is that the table should already be in first normal form.
Q: What is the significance of primary key in tables that are in second normal form?
A: Within a table that is in second normal form, the data in each column in each row is dependent on each row's entire primary key.
Q: What role does primary key play in indexing a row 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: What happens to columns that are not related to all columns in the primary key in a table that is in second normal form?
A: Columns that are not related to every column in the primary key are removed.
Q: What happens to columns that are related to all columns in the primary key in a table that is in second normal form?
A: Only columns that are related to all columns in the primary key are retained.
Q: How important is the second normal form criteria in database normalization?
A: The second normal form criteria is important in database normalization as it ensures that each column in a table is functionally dependent on the entire primary key, which leads to better data organization and reduced data redundancy.
