SQL Auto-Increment Column Guide

To add an auto-increment column in SQL Server, you can use the IDENTITY property. This property automatically generates unique incremental values for the column.

Here is how to add an auto-increment column in SQL Server:

1. Add an auto-increment column while creating the table.
2. Create a table with the following structure:
   Table name
   (
   Column name data type IDENTITY(initial value, increment)
   )
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4. This code segment is used to create a table named Customers with two columns: CustomerID as an integer that increments by 1 starting at 1, and CustomerName as a variable character with a maximum length of 50 characters.
5. In the example above, the CustomerID column is defined as an auto-increment column, with an initial value of 1 and an increment of 1.
6. Add an auto-increment column to an existing table.
7. Modify the table by adding a column with a specified data type and auto-increment starting value and increment value.
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9. Add a CustomerID column to the Customers table with auto-incrementing integer values starting from 1.
10. In the example above, the CustomerID column is included as an auto-increment column, starting at 1 with an increment of 1.

Whether creating a table or adding an auto-increment column to an already existing table, it is important to ensure that the data type of the column is compatible with the data types of other columns in the table. Auto-increment columns are typically used as primary keys for tables.