demo 12344, Sql Server

Language: Layout:

create table Tbl (FieldID int,   ChangeField nvarchar(1000), OldValue  int, NewValue int,  ChangeDate datetime)
insert into Tbl values
(1, 'interest', 1.5,        1.2,       '2018-05-01 13:00:00')
,(1, 'interest', 1.2,        1.3,       '2018-05-01 14:00:00')
,(1, 'quantity', 2  ,        1  ,       '2018-05-01 15:00:00')
,(1, 'quantity', 1  ,        2  ,       '2018-05-01 16:00:00')
,(1, 'quantity', 2  ,        3  ,       '2018-05-01 17:00:00')
,(2, 'quantity', 10 ,        20 ,       '2018-05-01 18:00:00')
,(2, 'quantity', 20 ,        30 ,       '2018-05-01 19:00:00');

;with cte as
( 
    select
    *,
    rn1= row_number() over (partition by FieldID,ChangeField order by ChangeDate asc),
    rn2= row_number() over (partition by FieldID,ChangeField order by ChangeDate desc)
    from
    Tbl
)

select 
    FieldId,
    ChangeField,
    ChangeDate=MAX(ChangeDate),
    Oldvalue= MAX(Case when rn1=1 then Oldvalue end),
    NewValue= MAX(Case when rn2=1 then NewValue end)
from cte 
    where  rn1=1 or rn2=1
group by 
    FieldId,ChangeField

View schema
Execution time: 0,02 sec, rows selected: 3, rows affected: 7, absolute service time: 0,19 sec