Finding first occurence of multiples value in every group sort by date in SQL

Question

I have a table with every operations that appends before an event group by another value.

There is only 3 operations: R, E, P

+ ----------+----------+--------         


        

Answer 1

If I followed you correctly, you can filter on records where order is greater or equal than blocking, and then do conditional aggregation:

select
    rollcycle,
    blocking,
    max(iif(operation = 'R', 1, 0)) R,
    max(iif(operation = 'E', 1, 0)) E,
    max(iif(operation = 'P', 1, 0)) P
from mytable 
where order >= blocking
group by rollcycle, blocking