CREATE {DATABASE|SCHEMA} [IF NOT EXISTS] database_name
     [COMMENT 'database_comment']
     [WITH DBPROPERTIES ('property_name' = 'property_value') [, ...]]

CREATE DATABASE IF NOT EXISTS db;

CREATE DATABASE db 
COMMENT 'db1_name' 
WITH DBPROPERTIES('k1' = 'v1','k2' = 'v2');