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

What you can do is.

update t
set colToUpdate = nextValue
from  (
select A
      ,B
      ,C
      ,(LEAD(B, 1, null) over (order by A)) as nextValue
  FROM db.schema.table
  ) as t
    where colToUpdate is null

This requires that the column you want to update is null, unless you want to update all of them.