Forces the named column to assume the default value defined for
    that column (or NULL if none is defined).

    If the DEFAULT clause is used in an INSERT statement then one of
    the following will be applied:

    o  If a DEFAULT attribute is present for the column then that
       value will be applied during INSERT.

    o  Else if an AUTOMATIC attribute is present for the column then
       that value will be applied during INSERT. This can only happen
       if the SET FLAGS 'AUTO_OVERRIDE' is used since during normal
       processing these columns are read-only.

    o  Otherwise a NULL will be applied during INSERT.