What is a primary key and foreign key?

What is the difference between primary key and foreign key explain with example?

A primary key is used to assure the value in the particular column is unique. The foreign key provides the link between the two tables. ... Difference Between Primary Key and Foreign Key.S.No.Primary KeyForeign Key5In the primary key, the value cannot be removed from the parent table.In this, the value can be deleted from the child table.

What is primary key and example?

A primary key is a column -- or a group of columns -- in a table that uniquely identifies the rows of data in that table. For example, in the table below, CustomerNo, which displays the ID number assigned to different customers, is the primary key. CUSTOMERS. CustomerNo.

What is a primary key key?

A primary key, also called a primary keyword, is a key in a relational database that is unique for each record. It is a unique identifier, such as a driver license number, telephone number (including area code), or vehicle identification number (VIN).

What is the meaning of foreign key?

A foreign key is a column or columns of data in one table that connects to the primary key data in the original table.