What is non-prime attribute in DBMS example?

What is non-prime attribute in DBMS example?

An attribute that is not part of any candidate key is known as non-prime attribute. Example: Suppose a school wants to store the data of teachers and the subjects they teach. They create a table that looks like this: Since a teacher can teach more than one subjects, the table can have multiple rows for a same teacher.

What is prime attribute?

Prime attributes are the attributes of the candidate key which defines the uniqueness (Eg: SSN number in an employee database) A primary key is a column in a table whose values uniquely identify the rows in the table.

Can non prime attribute determine prime attribute?

Please note: prime attribute is an attribute that is part of any candidate key. Non prime attribute is an attribute that is not part of any candidate key. If ‘A’ is a non prime attribute, it can determine a prime/non prime attribute.

What is prime attribute and non prime attribute in DBMS?

Please note: prime attribute is an attribute that is part of any candidate key. Non prime attribute is an attribute that is not part of any candidate key. So, its advisable that you find out all possible candidate keys from the given functional dependencies and mark the prime and non prime attributes.

What is Prime key and non prime key in DBMS?

A candidate key, or simply a key, of a relational database is a minimal superkey. The columns in a candidate key are called prime attributes, and a column that does not occur in ANY candidate key is called a non-prime attribute.

What are non key attributes in DBMS?

Non-key attributes are the attributes or fields of a table, other than candidate key attributes/fields in a table.

What is non prime attribute in DBMS?

Attributes of the relation which does not exist in any of the possible candidate keys of the relation, such attributes are called non prime attributes. Non prime attributes also called as Non Key attributes.

Can non-prime attribute determine prime attribute?

What are non prime attributes?

Non Prime or Non Key Attributes: Attributes of the relation which does not exist in any of the possible candidate keys of the relation, such attributes are called non prime or non key attributes.