In PL/SQL, how do you update a row based on the next row?

Question

I\'m using Oracle PL/SQL.

I have a timestamped table T, and I want to set a row\'s value for column A to be the same as that of the previous row, if they\'re sorted

Answer 1

Can you try something like this:

update x 
set x = y.A
from T x
join T y
where x.B = (select MAX(B) from T where B < y.B)
and x.Timestamp = (select MAX(Timestamp) from T where Timestamp < y.Timestamp)
and y.Timestamp - x.Timestamp < 45