id |      DateTime       | sys | dia | pulse |  ves  | numIzm | part 
----+---------------------+-----+-----+-------+-------+--------+------
  1 | 2020-09-20 12:18:03 | 157 |  87 |    87 | 129.9 |      1 |    0
  2 | 2020-09-20 12:34:59 | 147 |  86 |    84 | 129.9 |      2 |    0
  3 | 2020-09-20 22:34:19 | 148 |  84 |    94 | 131.7 |      1 |    1
  4 | 2020-09-20 22:36:08 | 136 |  77 |    94 | 131.7 |      2 |    1
  5 | 2020-09-21 13:53:28 | 166 |  92 |    79 | 130.8 |      1 |    0
  6 | 2020-09-21 13:53:28 | 159 |  87 |    78 | 130.8 |      2 |    0
  7 | 2020-09-21 23:30:08 | 134 |  77 |    95 | 132.4 |      1 |    1
  8 | 2020-09-21 23:32:22 | 138 |  76 |    93 | 132.4 |      2 |    1
  9 | 2020-09-21 23:33:46 | 138 |  76 |    93 | 132.4 |      3 |    1

myHealth=# select "DateTime"::date as "Дата",case when part=0 then 'Утро' when part=1 then 'Вечер' end as "Вр.суток",min(sys) as "Верхнее", min(dia) as "Нижнее", min(pulse) as "Пульс", min(ves) as "Вес" from "myH" group by "Вр.суток","Дата" order by "Дата","Вр.суток" DESC;;
    Дата    | Вр.суток | Верхнее | Нижнее | Пульс |  Вес  
------------+----------+---------+--------+-------+-------
 2020-09-20 | Утро     |     147 |     86 |    84 | 129.9
 2020-09-20 | Вечер    |     136 |     77 |    94 | 131.7
 2020-09-21 | Утро     |     159 |     87 |    78 | 130.8
 2020-09-21 | Вечер    |     134 |     76 |    93 | 132.4
(4 строки)

myHealth=# select distinct on ("Дата","Вр.суток") "DateTime"::date as "Дата",case when part=0 then 'Утро' when part=1 then 'Вечер' end as "Вр.суток",sys as "Верхнее", dia as "Нижнее", pulse as "Пульс", ves as "Вес" from "myH" order by "Дата","Вр.суток" desc,sys;
    Дата    | Вр.суток | Верхнее | Нижнее | Пульс |  Вес  
------------+----------+---------+--------+-------+-------
 2020-09-20 | Утро     |     147 |     86 |    84 | 129.9
 2020-09-20 | Вечер    |     136 |     77 |    94 | 131.7
 2020-09-21 | Утро     |     159 |     87 |    78 | 130.8
 2020-09-21 | Вечер    |     134 |     77 |    95 | 132.4