What Is a Primary Key Ict

A primary key is a field in a table which is unique and enables you to identify every record in that table. … Therefore, it is important that every single record in a database has something to uniquely identify it and this is called the ‘Primary Key’ or sometimes the ‘Key Field’.

What is a primary key in computer?

A primary key is the column or columns that contain values that uniquely identify each row in a table. A database table must have a primary key for Optim to insert, update, restore, or delete data from a database table.

What is a foreign key in ICT?

A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables. It acts as a cross-reference between tables because it references the primary key of another table, thereby establishing a link between them.