SQL allows you to specify an alias that declares the database as
    the default database. Specifying a default database means that
    subsequent statements during the database attachment that refer
    to the default database need not use an alias.

    In the SQL module language, the alias specified in the module
    header is the one that designates the default database. In
    precompiled SQL programs and in interactive SQL, the special
    alias RDB$DBHANDLE designates the default database. In all
    environments, omitting an explicit alias is the same as
    specifying the alias that designates the default database.

    Select More_Information to continue.