I would like to delete the columns

Hello
with dummy as ( select 2526 Column1, 1 Column2, 2 Column3, 3 Column4 from dual union all
                        select 2526 Column1, 4 Column2, 5 Column3, 6 Column4 from dual union all
                        select 4711 Column1, 1 Column2, 1 Column3, 3 Column4 from dual union all
                        select 4711 Column1, 3 Column2, 2 Column3, 1 Column4 from dual)
select * from dummy
/

   COLUMN1    COLUMN2    COLUMN3    COLUMN4
---------- ---------- ---------- ----------
      2526          1          2          3
      2526          4          5          6
      4711          1          1          3
      4711          3          2          1
I would like to have the following result.
   COLUMN1    COLUMN2    COLUMN3    COLUMN4
---------- ---------- ---------- ----------
      2526          1          2          3
      2526          
      4711          1          1          3
      4711         
Does anyone have an idea?

Try this,

WITH dummy AS ( SELECT 2526 Column1, 1 Column2, 2 Column3, 3 Column4 FROM dual UNION ALL
                        SELECT 2526 Column1, 4 Column2, 5 Column3, 6 Column4 FROM dual UNION ALL
                        SELECT 4711 Column1, 1 Column2, 1 Column3, 3 Column4 FROM dual UNION ALL
                        SELECT 4711 Column1, 3 Column2, 2 Column3, 1 Column4 FROM dual)
SELECT column1,
       DECODE (rn, 1, column2) column2,
       DECODE (rn, 1, column3) column3,
       DECODE (rn, 1, column4) column4
  FROM (SELECT d.*, ROW_NUMBER () OVER (PARTITION BY column1 ORDER BY column2) rn
          FROM dummy d)

OUTPUT
-------------

   COLUMN1    COLUMN2    COLUMN3    COLUMN4
---------- ---------- ---------- ----------
      2526          1          2          3
      2526
      4711          1          1          3
      4711

SQL>

G.

Tags: Database

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