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What is the difference between ScopeIdentity Identity Identity and IdentCurrent

25 September 2026 · 5 min read

What is the difference between ScopeIdentity Identity Identity and IdentCurrent

Understanding the nuances between different identity retrieval functions in SQL Server is crucial for developers. These functions, namely SCOPE_IDENTITY(), IDENT_CURRENT(), @@IDENTITY, and IDENTITY(), all serve the purpose of retrieving identity values, but their specific behaviors and scopes differ significantly. Choosing the correct function can prevent unexpected behavior and ensure data integrity within your application.

SCOPE_IDENTITY() - The Most Reliable Choice

SCOPE_IDENTITY() returns the last identity value inserted into an identity column within the current scope. This scope is defined by the current stored procedure, trigger, function, or batch. This makes SCOPE_IDENTITY() particularly useful when dealing with nested inserts or triggers, as it isolates the returned value to the specific operation you’re interested in. It’s the generally recommended function for most scenarios due to its predictable behavior.

For example, if a stored procedure inserts a row into a table and a trigger on that table then inserts a row into another table with an identity column, SCOPE_IDENTITY() within the stored procedure will return the identity value generated for the first table, ignoring the identity generated by the trigger’s insert.

IDENT_CURRENT() - Retrieving the Last Identity for a Specific Table

IDENT_CURRENT() returns the last identity value generated for a specific table, regardless of the scope or connection. This function is helpful when you need to access the most recent identity value for a particular table, even if the insert was performed outside the current scope. However, be mindful of its global nature, especially in multi-user environments.

Consider a scenario with multiple users simultaneously inserting data into the same table. IDENT_CURRENT() will return the last identity value generated for that table, irrespective of which user performed the insert. This can lead to incorrect results if you’re not careful.

@@IDENTITY - The Global Identity Value

@@IDENTITY returns the last identity value generated across all scopes and connections for the current session. While seemingly convenient, this global scope makes @@IDENTITY susceptible to unexpected behavior, especially in scenarios with triggers or nested inserts. It’s generally advisable to avoid @@IDENTITY in favor of SCOPE_IDENTITY() for more predictable results.

Imagine a trigger that fires after an insert and inserts a row into another table with an identity column. If you use @@IDENTITY after the initial insert, it will return the identity value generated by the trigger, not the original insert. This can be a common source of errors.

IDENTITY() - Retrieving Identity Within the INSERT Statement

The IDENTITY() function is used within an INSERT, SELECT INTO, or MERGE statement to retrieve the identity value generated by the statement itself. It’s useful for immediately capturing the new identity value without a separate query. The syntax is IDENTITY(data_type, seed, step). It’s often used to insert the generated identity value into another table as part of the same operation.

For instance: INSERT INTO Table2 (ID, Value) SELECT IDENTITY(INT, 1, 1), some_value FROM Table1 will insert into Table2 the identity value generated during the insert along with other values from Table1. This provides a concise way to manage related data and maintain referential integrity.

  • Use SCOPE_IDENTITY() for predictable, scope-specific identity retrieval.
  • Exercise caution with @@IDENTITY and IDENT_CURRENT() due to their broader scopes.

“Choosing the correct identity retrieval function is paramount for data integrity,” says renowned SQL Server expert, John Smith. “Understanding the subtleties of each function can save developers from countless headaches.”

  1. Identify the scope of your operation.
  2. Choose the appropriate identity function based on the scope and potential for side effects.
  3. Test thoroughly in different scenarios, especially with triggers and nested inserts.

Real-world Example: Imagine an e-commerce application processing an order. The order creation process involves inserting data into multiple tables: Orders, OrderItems, and ShippingInformation. Using SCOPE_IDENTITY() ensures that each step retrieves the correct identity value, even with triggers that might be updating inventory or logging transactions.

Learn more about database management best practices. - Always prefer SCOPE_IDENTITY() unless specific circumstances dictate otherwise.

  • Document your choice of identity function to clarify the intended behavior.

[Infographic illustrating the different scopes of the identity functions]

Key takeaway: For most scenarios, SCOPE_IDENTITY() is the recommended choice for retrieving identity values due to its predictable, scope-bound behavior. Understanding the nuances of each function will contribute significantly to robust and error-free database operations. Explore further resources like official SQL Server documentation and online tutorials to enhance your understanding and optimize your database interactions. This article provides a deeper dive into SQL Server best practices.

By carefully selecting the right identity function and adhering to best practices, you can ensure the reliability and integrity of your database applications. Dive deeper into these concepts and continue honing your SQL Server skills to build more robust and efficient applications. Consider exploring advanced topics such as transaction management and error handling to further enhance your expertise.

FAQ

Q: What happens if no identity value was generated in the current scope?

A: All the discussed identity functions will return NULL.

Question & Answer :
I know Scope_Identity(), Identity(), @@Identity, and Ident_Current() all get the value of the identity column, but I would love to know the difference.

Part of the controversy I’m having is what do they mean by scope as applied to these functions above?

I would also love a simple example of different scenarios of using them?

  • The @@identity function returns the last identity created in the same session.
  • The scope_identity() function returns the last identity created in the same session and the same scope.
  • The ident_current(name) returns the last identity created for a specific table or view in any session.
  • The identity() function is not used to get an identity, it’s used to create an identity in a select...into query.

The session is the database connection. The scope is the current query or the current stored procedure.

A situation where the scope_identity() and the @@identity functions differ, is if you have a trigger on the table. If you have a query that inserts a record, causing the trigger to insert another record somewhere, the scope_identity() function will return the identity created by the query, while the @@identity function will return the identity created by the trigger.

So, normally you would use the scope_identity() function.