Creates a Kerberos-authenticated login mapping from one or more Kerberos principals to an existing database user ID. This allows a user who has successfully logged in to Kerberos (user who has a valid Kerberos ticket-granting ticket) to connect to a database without having to provide a user ID or password.
GRANT KERBEROS LOGIN TO <client-Kerberos-principal [, …]> AS USER <userID [,...]>
SQL–other syntaxes are vendor extensions to ISO/ANSI SQL grammar.
SAP Database products–the security model is different in SAP ASE and SAP IQ, so other syntaxes differ.