Specifies the name of the default catalog for a multischema
    database. If you omit the catalog name when you specify an object
    in a multischema database, SQL uses the default catalog name.
    If you do not specify a default catalog name, the default is
    RDB$CATALOG.

    If you qualify the catalog name with an alias, the alias and
    catalog name pair must be in uppercase characters and you must
    enclose the alias and catalog name pair within double quotation
    marks.

    See the User_Supplied_Names HELP topic for more information on
    catalogs.