Hello friends, In this tutorial, we are going to see the IDENTITY column in SQL Server. what is the difference between @@IDENTITY, IDENT_CURRENT, and SCOPE_IDENTITY?                                                                                                                                                                                                                             An Identity column in SQL Server is a column that stores the value generated by the SQL Server Database. This is very similar to AutoNumber in SQL Server or Sequence in Oracle.


An Identity column in SQL Server is a column that stores the value generated by the SQL Server Database.
This is very similar to AutoNumber in SQL Server or Sequence in Oracle.
In this tutorial, we are going to discuss different option for Identity Column.


Let’s discuss each of these terms in detail.

Difference between


@@IDENTITY returns last identity value generated for any table in the active sessions across all scopes.

For example:

Suppose I have two tables called table1 and table2 and I have created a trigger on table1 that will insert
record in table2 then @@IDENTITY will return the IDENTITY value of table 2.


It returns the last identity value generated for a specific table in any session and any scope. That means it is not affected by Scopes and Sessions it is only related to the specific table.

For example:

if I am using SCOPE_IDENTITY for table1 then it will return IDENTITY value for table1.


Returns the last identity value inserted into an identity column in the same scope. A scope can be a Stored Procedure, User Defined Function, Trigger or batch. Therefore, if two statements are in the same stored procedure, function, or batch, they are in the same scope.

For example:

Suppose we create an insert trigger on the table which inserts a row in another table with generating an identity column, Then the Scope_IDENTITY will return the IDENTITY value of table on which the record is being inserted.



CREATE TABLE Table2(ID int IDENTITY(100,1));








--End of trigger definition

--id is empty.

--ID is empty.

--Do the following in Session 1
/*Returns the value 100. This was inserted by the trigger.*/

/* Returns the value 1. This was inserted by the
INSERT statement two statements before this query.*/


/* Returns value inserted into Table2, that is in the trigger.*/


/* Returns value inserted into Table1. 
This was the INSERT statement four statements before this query.*/

-- Do the following in Session 2.


/* Returns NULL because there has been no INSERT action
up to this point in this session.*/


/* Returns NULL because there has been no INSERT action
up to this point in this scope in this session.*/


/* Returns the last value inserted into Table2.*/

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I hope you understand what exactly is the difference between @@IDENTITY, IDENT_CURRENT, and SCOPE_IDENTITY.

Thank You.


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