IDENT_CURRENT – returns the last identity value generated for a specific table in any session and any scope
@@IDENTITY – returns the last identity value generated for any table in the current session, across all scopes
SCOPE_IDENTITY – returns the last identity value generated for any table in the current session and the current scope
Comparing identity values returned by IDENT_CURRENT, @@IDENTITY and SCOPE_IDENTITY
The following example shows the different identity values that are returned by IDENT_CURRENT, @@IDENTITY, and SCOPE_IDENTITY.
GO
IF OBJECT_ID(N’t6′, N’U') IS NOT NULL
DROP TABLE t6;
GO
IF OBJECT_ID(N’t7′, N’U') IS NOT NULL
DROP TABLE t7;
GO
CREATE TABLE t6(id int IDENTITY);
CREATE TABLE t7(id int IDENTITY(100,1));
GO
CREATE TRIGGER t6ins ON t6 FOR INSERT
AS
BEGIN
INSERT t7 DEFAULT VALUES
END;
GO
–End of trigger definition
SELECT id FROM t6;
–id is empty.
SELECT id FROM t7;
–ID is empty.
–Do the following in Session 1
INSERT t6 DEFAULT VALUES;
SELECT @@IDENTITY;
/*Returns the value 100. This was inserted by the trigger.*/
SELECT SCOPE_IDENTITY();
/* Returns the value 1. This was inserted by the
INSERT statement two statements before this query.*/
SELECT IDENT_CURRENT(‘t7′);
/* Returns value inserted into t7, that is in the trigger.*/
SELECT IDENT_CURRENT(‘t6′);
/* Returns value inserted into t6. This was the INSERT statement four statements before this query.*/
– Do the following in Session 2.
SELECT @@IDENTITY;
/* Returns NULL because there has been no INSERT action
up to this point in this session.*/
SELECT SCOPE_IDENTITY();
/* Returns NULL because there has been no INSERT action
up to this point in this scope in this session.*/
SELECT IDENT_CURRENT(‘t7′);
/* Returns the last value inserted into t7.*/
