If you have invoked a database, you have the necessary privileges
    to use the DECLARE_STREAM statement.

    Use the DECLARE_STREAM statement in conjunction with the declared
    START_STREAM statement. The DECLARE_STREAM statement will not
    work in conjunction with the undeclared START_STREAM statement.

    Rdb recommends that all programs use the DECLARE_STREAM statement
    (with the declared START_STREAM statement) instead of the undeclared
    START_STREAM statement. The declared START_STREAM statement provides
    all the functions of the undeclared START_STREAM statement and
    provides more flexibility in programming than the undeclared
    START_STREAM statement.

    Put the DECLARE_STREAM statement before the associated declared
    START_STREAM, FETCH, and END_STREAM statements.

    The DECLARE_STREAM statement allows the use of fewer or more
    END_STREAM statements than START_STREAM statements within the
    same module, as long as at execution time exactly one END_STREAM
    statement is executed for each START_STREAM statement.

    RDO does not allow a record stream from which data values cannot be
    fetched by DBKEY (views that retrieve values from streams defined using
    the SQL GROUP BY or UNION clauses) to be declared or started. Such
    attempts produce the following exception:

      VWNOFETCH view 'view-name' cannot be fetched within a stream