After an INSERT, SELECT INTO, or bulk copy statement is completed,
@@IDENTITY contains the last identity value that is generated by the statement.
If the statement did not affect any tables with identity columns, @@IDENTITY returns NULL.
If multiple rows are inserted, generating multiple identity values, @@IDENTITY returns
the last identity value generated.

Transact-SQL statements can set the value in @@ROWCOUNT in the following ways:
Set @@ROWCOUNT to the number of rows affected or read. Rows may or may not be sent to the client.
Preserve @@ROWCOUNT from the previous statement execution.
Reset @@ROWCOUNT to 0 but do not return the value to the client.


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