How to update colomn depend on the other in the same table

Question

hi ,
i have the following table with 2 colomns (A and B)
A B
100 null
90 null
80 null
70 null
60 null
and i want move the first max 2 number to the colomn B to be like this
A B
80 100
70 90
60 null
and help please ,

Answer 1

with t as ( select 100 A, null B from dual union
               select 90, null from dual union
               select 80 ,null from dual union
               select 70, null from dual union
               select 60, null from dual)
      select A, B
      from t
      model
      dimension  by (row_number() over (order by A desc) num )
      measures (A, cast (null as number)  B, count(*) over ()  cnt )
      RULES (
             B [for num from 1 to 2  increment 1] =  A[cv()],
             A[for num from 1 to cnt[1] increment 1] =  A[cv() + 2]
A     B
80     100
70     90
60Edited by: pollywog on Jun 15, 2011 3:44 PM
or if you have 11g there is now a fuction called nth_value
/* Formatted on 6/15/2011 4:03:51 PM (QP5 v5.149.1003.31008) */
WITH t AS (SELECT 100 A, NULL B FROM DUAL
           UNION
           SELECT 90, NULL FROM DUAL
           UNION
           SELECT 80, NULL FROM DUAL
           UNION
           SELECT 70, NULL FROM DUAL
           UNION
           SELECT 60, NULL FROM DUAL)
  SELECT LEAD (A, 2) OVER (ORDER BY A DESC) A,
         CASE
            WHEN A < NTH_VALUE (MAX (A), 2) OVER (ORDER BY A DESC) THEN NULL
            ELSE A
         END
            B
    FROM t
GROUP BY AEdited by: pollywog on Jun 15, 2011 4:04 PM