IDENTITY in SQL Server

IDENTITY is an asset used in SQL Server to create a sequence of numbers in a desk column. It is typically used to create a one-of-a-kind primary target. Let’s study the syntax and deliver a sensible instance:

Syntax:

• column_name: The name of the column to which you want to assign the IDENTITY property.
• data_type: The data type of the column.
• IDENTITY: Specifies that this column will automatically generate values.
• result: This displays the initial value of the identity column.
• increment: Defines the term by which the values ​​are incremented with each input.

Example:

Let’s say we’ve a desk to shop purchaser data, and we need to create an car-increasing specific identifier for every client. We can use the IDENTITY assets to reap this:

IIn this example, we created the “Customers” table with the “CustomerID” column set as the identification column. It starts at 1 and will increase via 1 whenever a new file is inserted. This means that every new consumer delivered to the desk can have a completely unique “CustomerID” price that does not need to be entered manually.

Now whilst you add new clients to the table, you do not want to specify a fee for the “CustomerID” column. SQL Server will create and offer the following available cost:

The “CustomerID” for this new customer is generated automatically, to ensure that this is unique within the table.

In SQL Server International, there are fundamental methods for producing collection numbers: IDENTITY and SEQUENCE. These gear are priceless for growing unique columns in a database, however, additionally, they have different packages.

• IDENTITY is a column-degree asset that has been a part of SQL Server for some time and is to be had in all variations. It generates a series of values ​​on the desk level, perfect for storing specific keys in a specific table.
• SEQUENCE, however, is a recent addition, brought in SQL Server 2012. It is a function that permits sequential sharing of numbers throughout tables, imparting more flexibility and freedom than any specific table.