Question

In SQL, what does "identity" refer to?

a) A security feature for user authentication
b) A data type for storing dates and times
c) A property for generating unique values automatically
d) A method for encrypting data in a table

Answer 1

In SQL, "identity" refers to a property for generating unique values automatically, commonly used as a primary key.

Step-by-step explanation:

In SQL, the term "identity" refers to a property for generating unique values automatically. It is used to create a column in a table that automatically generates a new value for each row inserted into the table.

For example, in Microsoft SQL Server, the "identity" property can be applied to a column to automatically generate a unique, incremental number for each new row added to the table.

This is commonly used as a primary key to ensure each row in the table has a unique identifier.