Question

discuss the significance of primary key columns and table with suitable example? ​

Answer 1

A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records. A primary key's main features are: It must contain a unique value for each row of data. It cannot contain null values.For example, a database must hold all of the data stored by a commercial bank. Two of the database tables include the CUSTOMER_MASTER, which stores basic and static customer data (name, date of birth, address, Social Security number, etc.) and the ACCOUNTS_MASTER, which stores various bank account data (account creation date, account type, withdrawal limits or corresponding account information, etc.).

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Answer 2

A primary key is a table column that serves a special purpose. Each database table needs a primary key because it ensures row-level accessibility.
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