Specifies a collating sequence for the named domain. The OpenVMS National Character Set (NCS) utility provides a set of predefined collating sequences and also lets you define collating sequences of your own. The COLLATING SEQUENCE clause accepts both predefined and user-defined NCS collating sequences. Before you use the COLLATING SEQUENCE clause in a CREATE DOMAIN statement, you must first specify the NCS collating sequence for SQL using the CREATE COLLATING SEQUENCE statement. The sequence- name argument in the COLLATING SEQUENCE clause must be the same as the sequence-name in the CREATE COLLATING SEQUENCE statement.