Specifies a quoted string containing full or partial information
    needed to access a database. An attach specification contains the
    file specification of the .rdb file.

    The DROP DATABASE statement deletes the database and all
    database system files associated with the database root file
    specification. If you use a partial file specification, SQL uses
    the standard defaults. The DROP DATABASE statement deletes only
    the database files, whether or not there is also a repository
    directory containing database definitions.