How to determine next row value using select and case in SQL server?

Question

Using select and case statement in SQL

How to make the 4th column "1" if next row of LETTER column is D. See example below:

https://i.stack.imgur.com/br4dn.png

Answer 1

You can combine CASE with LEAD() . Assuming you are ordering by step the query can look like:

select
  t.*,m
  case when lead(letter) over(order by step) = 'D' 
       then 1 else 0 end as is_next_row_letter_d
from t

Answer 2

Assuming that the STEP column provides the ordering and that it is continuous, we could use a self-join approach here:

SELECT t1.STEP, t1.ID, t1.LETTER,
       CASE WHEN t2.LETTER = 'D' THEN 1 ELSE 0 END AS IS_NEXT_D
FROM yourTable t1
LEFT JOIN yourTable t2
    ON t2.STEP = t1.STEP + 1
ORDER BY t1.STEP;