SELECT @@IDENTITY
It returns the last IDENTITY value produced on a connection, regardless
of the table that produced the value, and regardless of the scope of the
statement that produced the value.
@@IDENTITY will return the last identity value entered into a table in
your current session. While @@IDENTITY is limited to the current
session, it is not limited to the current scope. If you have a trigger
on a table that causes an identity to be created in another table, you
will get the identity that was created last, even if it was the trigger
that created it.
SELECT SCOPE_IDENTITY()
It returns the last IDENTITY value produced on a connection and by a
statement in the same scope, regardless of the table that produced the
value.
SCOPE_IDENTITY(), like @@IDENTITY, will return the last identity value
created in the current session, but it will also limit it to your
current scope as well. In other words, it will return the last identity
value that you explicitly created, rather than any identity that was
created by a trigger or a user defined function.
SELECT IDENT_CURRENT(‘tablename’)
It returns the last IDENTITY value produced in a table, regardless of
the connection that created the value, and regardless of the scope of
the statement that produced the value.
IDENT_CURRENT is not limited by scope and session; it is limited to a
specified table. IDENT_CURRENT returns the identity value generated for a
specific table in any session and any scope.
To avoid the potential problems associated with adding a trigger later on, always use SCOPE_IDENTITY() to return the identity of the recently added row in your T SQL Statement or Stored Procedure.
