SQL interview questions Create an auto id increment Column without using identity #sqlserver

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SQL interview questions Create an auto id increment Column without using identity

To generate an auto-increment column without using the identity property in SQL, you can employ a combination of triggers and sequences. By creating a sequence and defining a trigger that fires before an INSERT operation, you can manually increment the value of the column. This approach allows for more flexibility in customization compared to the identity property. Sequences provide a separate entity to manage the incrementing values, while triggers control the timing and execution of the incrementation process during data insertion.

In SQL Server, a sequence is an object that generates a series of numeric values in a specified order. It provides a scalable and efficient way to generate unique identifiers, often used for auto-incrementing primary key columns in tables.

here is another sql interview questions prevent insert numeric or digits values in nvarchar datatype column
To prevent the insertion of numeric or digit values into an nvarchar datatype column, enforce a check constraint on the column. This constraint can be configured to ensure that only character-based data is allowed, thereby restricting the input to non-numeric values.

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