text: with
  param as (select to_date('09.05.2019 00:00:00','DD.MM.YYYY HH24:MI:SS') date_begin,
                   to_date('11.05.2019 00:00:00','DD.MM.YYYY HH24:MI:SS') date_end,
                   1/24/60                                                date_step
                   from dual),
  scale as (select
             param.date_begin+(level-1)*param.date_step date1,
             param.date_begin+level*param.date_step date2
            from dual, param
            connect by param.date_begin+(level-1)*param.date_step between param.date_begin and param.date_end)
  select
   to_char(date1, 'DD.MM.YYYY HH24:MI:SS') d,
   date1-p.date_begin v
  from
   param p, scale
  