I need to transform a simple historical table to slowly changing dimention (exmpl below). What is the most efficient way to do that?
Input
ID - Update_date
----------
143432 - '2019-02-03'
143432 - '2019-11-01'
143432 - '2020-03-16'
Output
ID - row_actual_date_from - row_actual_date_to
----------
143432 - '2019-02-03' - '2019-10-31'
143432 - '2019-11-01' - '2020-03-15'
143432 - '2020-03-16' - '9999-12-31'
I think you can just use LEAD
here:
SELECT
ID,
Update_date AS row_actual_date_from,
DATEADD(day, -1, LEAD(Update_date, 1, '9999-12-31')
OVER (PARTITION BY ID ORDER BY Update_date)) AS row_actual_date_to
FROM yourTable
ORDER BY
ID,
Update_date;