CODE EXAMPLE FOR SQL

select value from previous row in postgresql

-- use LAG(column_name, lag) OVER (PARTITION BY x ORDER BY y)
select
	id,
	version,
	start_date,
	lag(dss_end_date, 1) over (partition by id order by version) as previous_row_end_date
	end_date
from
	table
order by
	id,
	version;