What is primary key IT Class 10?

What is the primary key?

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 primary key and example?

A primary key is a column -- or a group of columns -- in a table that uniquely identifies the rows 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 primary key 11th class?

Solution. Primary Key: A column in the table that uniquely identifies each row in that table is called a primary key.

What is a primary key answer the following question?

Answer. A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records.