how to return 2nd row record for only 1 column

Question

I am selecting multiple column from a table, and one of the column i require to fetch record from second row. How should i specify in my query that only that 1 column need to fetch from row 2? The select statement return 2 rows, but segment 4 i need to return 2nd row value only, other column return value of row 1. How should i write it?

select  substrb(segment2,1,30) invtime
 ,  substrb(segment3,1,30) invoice
 ,  substrb(segment4,1,10) invdate
from error_process_log;

Answer 1

You can use Anlaytical functions like Lead() Lag() in this scenario. Hope below illustration helps.

SELECT SUBSTR(a.nm,1,10),
  SUBSTR(lead(a.sn) over(order by a.sn ),1,5)
FROM
  (SELECT 1 AS seq,'avrajit' nm,'Roy1' sn FROM dual
  UNION ALL
  SELECT 2 AS seq,'shubho' nm,'Roy2' sn FROM dual
  UNION ALL
  SELECT 3 AS seq,'papa' nm,'Roy3' sn FROM dual
  UNION ALL
  SELECT 3 AS seq,'romi' nm,'Roy4' sn FROM dual
  )a;