Specifies columns whose values are used as limits for
    partitioning the index across multiple storage areas. You cannot
    name columns not specified as index key segments.

    If the index key is multisegmented, you can include some or all
    the columns that are joined to form the index key. You must
    specify the columns in the order in which they were specified
    when the index key was defined. If you only include a subset
    of the columns, you must include the leading segments of the
    multisegmented index.

    For example, if a CREATE INDEX statement specifies a
    multisegmented index based on the columns LAST_NAME, FIRST_NAME,
    and MIDDLE_INITIAL, then the USING clause must include the first
    segment LAST_NAME, or the first two segments, LAST_NAME, and
    FIRST_NAME, or all the segments of the index. This is true for
    sorted indices only.

    The database system uses the values of the columns specified in
    the STORE USING clause as a key to determine in which storage
    area an index entry associated with a new table row belongs.

    There is no restriction for hashed scattered indexes. For hashed
    ordered indexes, all segments listed, except the last segment
    can be included. Also, HASHED ORDERED indexes have further
    restrictions on the data type of the final column; it must be
    a date/time or integer numeric data type.