CLOUD COMPUTING

Detailed explanation-1: -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.

Detailed explanation-2: -What Does Primary Key Mean? A primary key is a special relational database table column (or combination of columns) designated to uniquely identify each table record. A primary key is used as a unique identifier to quickly parse data within the table. A table cannot have more than one primary key.

Detailed explanation-3: -The given statement is true. The value in a primary key is different and cannot match with any other record in the table. The table’s primary key serves as its unique identification.

Detailed explanation-4: -A primary key helps us to uniquely identify a record in a relational database. a primary key is a unique identifier for each record or row of data. It ensures that no two records have the same key value. In a table, only one primary key is allowed.

Detailed explanation-5: -Primary key is used to identify the unique record from a collection of records. To relate two tables, a primary key field in one table is added to the related table, and it is called as a foreign key.