WITH CALLER PRIVILEGES

By default, the SQL statement is executed with the privileges of the current user.Specifying WITH CALLER PRIVILEGES combines the privileges of the calling procedure or trigger with those of the user, as if the statement were executed directly by the routine.WITH CALLER PRIVILEGES has no effect if the ON EXTERNAL clause is also present.

With ON EXTERNAL [DATA SOURCE], the SQL statement is executed in a separate connection to the same or another database, possibly even on another server.If connection_string is NULL or “''” (empty string), the entire ON EXTERNAL [DATA SOURCE] clause is considered absent, and the statement is executed against the current database.