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Sorry for confusion..
I have data like below..
here I want to pick one row for each inr & rd for latest timestamp(dt col)..
if we have multiple rows for latest timestamp for that inr & rd then I want to get the latest row id rows for that latest(max) dt for each inr & rd...
like below highlighted rows are my output for this scenario
table contains 5+ billion rows, 100+ columns, for specific process it will fetch only 1MM rows
PI for inr & rd columns, PPI for inr column
any suggestion in performance stand point..
inr rd dt (date & timestamp upto micro sec) c1 c2 … c1001 1 2000-01-01 10:10:10 1111 1 1 …
1 1 2000-01-01 10:10:10 2222 2 2 …
1 1 2000-01-01 10:10:10 3333 3 3 …
1 1 2000-01-01 10:10:10 4444 4 4 …
1 2 2000-01-01 10:10:10 1111 1 1 …
1 2 2000-01-01 10:10:10 4444 4 4 …
1 2 2000-01-01 10:10:10 4444 5 5 …
1 2 2000-01-01 10:10:10 4444 5 5 …
1 2 2000-01-01 10:10:10 2222 2 2 …
1 2 2000-01-01 10:10:10 3333 3 3 …
1 3 2000-01-01 10:10:10 1111 1 1 …
1 3 2000-01-01 10:10:10 3333 4 4 …
1 3 2000-01-01 10:10:10 3333 4 4 …
1 3 2000-01-01 10:10:10 3333 5 5 …
1 3 2000-01-01 10:10:10 2222 2 2 …