Transpose a query output

Question

I have a normal select query which results following output.

select cid,x1,x2,x3,x4,fy
  from temp_table;

cid     x1  x2  x3  x4  fy
-----------------------         


        

Answer 1

Three possible options to transpose in Oracle 11G

• DECODE Option

  • a. Use SUM and DECODE for the new columns if you want to transpose and summarize

  • b. Use MAX and DECODE for the new columns if you want to transpose and not to summarize

• Use PIVOT

• Use WITH and SUB SELECT as said by Gordon

To use pivot, it is not possible in your code since your initial data set is already pivoted.

WITH TEMP1
    AS (SELECT
             6657 AS CID,
             100 AS VAL,
             'X1' AS XCORD,
             2014 AS FY
        FROM
             DUAL
        UNION ALL
        SELECT
             6657 AS CID,
             0 AS VAL,
             'X2' AS XCORD,
             2014 AS FY
        FROM
             DUAL
        UNION ALL
        SELECT
             6657 AS CID,
             0 AS VAL,
             'X3' AS XCORD,
             2014 AS FY
        FROM
             DUAL
        UNION ALL
        SELECT
             6657 AS CID,
             200 AS VAL,
             'X4' AS XCORD,
             2014 AS FY
        FROM
             DUAL
        UNION ALL
        SELECT
             6658 AS CID,
             300 AS VAL,
             'X1' AS XCORD,
             2015 AS FY
        FROM
             DUAL
        UNION ALL
        SELECT
             6658 AS CID,
             0 AS VAL,
             'X2' AS XCORD,
             2015 AS FY
        FROM
             DUAL
        UNION ALL
        SELECT
             6658 AS CID,
             0 AS VAL,
             'X3' AS XCORD,
             2015 AS FY
        FROM
             DUAL
        UNION ALL
        SELECT
             6658 AS CID,
             400 AS VAL,
             'X4' AS XCORD,
             2015 AS FY
        FROM
             DUAL
        UNION ALL
        SELECT
             6659 AS CID,
             500 AS VAL,
             'X1' AS XCORD,
             2016 AS FY
        FROM
             DUAL
        UNION ALL
        SELECT
             6659 AS CID,
             0 AS VAL,
             'X2' AS XCORD,
             2016 AS FY
        FROM
             DUAL
        UNION ALL
        SELECT
             6659 AS CID,
             0 AS VAL,
             'X3' AS XCORD,
             2016 AS FY
        FROM
             DUAL
        UNION ALL
        SELECT
             6659 AS CID,
             600 AS VAL,
             'X4' AS XCORD,
             2016 AS FY
        FROM
             DUAL)
SELECT
      *
FROM
      (SELECT
            XCORD,
            FY,
            SUM ( VAL ) AS VAL
       FROM
            TEMP1
       GROUP BY
            XCORD,
            FY) PIVOT (SUM ( VAL ) FOR FY IN ('2014', '2015', '2016'))
ORDER BY
      XCORD;

Results:

XCORD   '2014'  '2015'  '2016'
-----   ------  ------  ------
X1  100 300 500
X2  0   0   0
X3  0   0   0
X4  200 400 600

If you look into the data set you can see that the results are

CID     VAL     XCORD   FY
----    ----    -----   ----
6657    100 X1  2014
6657    0   X2  2014
6657    0   X3  2014
6657    200 X4  2014
6658    300 X1  2015
6658    0   X2  2015
6658    0   X3  2015
6658    400 X4  2015
6659    500 X1  2016
6659    0   X2  2016
6659    0   X3  2016
6659    600 X4  2016

Which is more or less a UNPIVOT of your data.