Question

Possible Duplicate:
Best way to get identity of inserted row?

When is it appropriate and how should someone use the different IDENTITY key word in T-SQL?

• SELECT @@IDENTITY,
• SELECT SCOPE_IDENTITY()
• SELECT IDENT_CURRENT(‘tablename’)

Answer 1

Have a look at SQL SERVER – @@IDENTITY vs SCOPE_IDENTITY() vs IDENT_CURRENT – Retrieve Last Inserted Identity of Record

From the article

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.