Скачать или смотреть How to Add an Identity Column to the Employees Table in SQL Server

Learn the correct syntax to add an identity column to the Employees table using SQL Server.
---
Disclaimer/Disclosure: Some of the content was synthetically produced using various Generative AI (artificial intelligence) tools; so, there may be inaccuracies or misleading information present in the video. Please consider this before relying on the content to make any decisions or take any actions etc. If you still have any concerns, please feel free to write them in a comment. Thank you.
---
How to Add an Identity Column to the Employees Table in SQL Server

When working with SQL Server, you may find the need to add an identity column to your tables. An identity column is a column whose value automatically increments when a new row is added to the table. It is particularly useful for generating unique keys.

In this post, we will discuss the correct syntax to add an identity column to the Employees table in SQL Server. We will use ALTER TABLE and ADD COLUMN SQL commands.

SQL Syntax to Add an Identity Column

To add an identity column to an existing table in SQL Server, you can use the following syntax:

[[See Video to Reveal this Text or Code Snippet]]

Explanation

ALTER TABLE Employees: This part of the SQL command specifies that we are altering the table named Employees.

ADD EmployeeID INT: Here, we are adding a new column named EmployeeID of type INT.

IDENTITY(1,1): This specifies that the EmployeeID column is an identity column. The (1,1) part means that the identity column starts at 1 and increments by 1 for each new row.

PRIMARY KEY: Adding this makes EmployeeID the primary key for the Employees table, ensuring each value is unique and not NULL.

This command can be executed in SQL Server Management Studio (SSMS) or any SQL interface supported by SQL Server.

Conclusion

Adding an identity column to your SQL Server table is straightforward with the ALTER TABLE and ADD COLUMN commands. The identity column can help you manage unique key values efficiently and ensure the integrity of your data.

By following the provided syntax, you can seamlessly add an identity column to your Employees table and take full advantage of SQL Server's capabilities.

[[See Video to Reveal this Text or Code Snippet]]

This is all you need to begin automating the incrementing key values in your Employees table.