Query to splict a column to multiple columns?

Question

For example, i have a table A:
ID | Date | Value
--- | --------- | --------
1 | 2007-01-02 | 10
2 | 2007-01-02 | -5
3 | 2007-01-03 | -8
4 | 2007-01-04 | 20
How can I query the table into this kind of output:
ID | Date | Positive | Negative
---- | --------- | ------- | -------
1 | 2007-01-02 | 10 |
2 | 2007-01-02 | | -5
3 | 2007-01-03 | | -8
4 | 2007-01-04 | 20 |

Answer 1

Hi,
Try this:
SQL> SET COLSEP '|'
SQL> ed
Wrote file afiedt.buf
  1  WITH TMP_QRY AS (
  2  SELECT 1 ID , '2007-01-02' Dt , 10 VAL  FROM DUAL UNION ALL
  3  SELECT 2 , '2007-01-02' , -5 FROM DUAL UNION ALL
  4  SELECT 3 , '2007-01-03' , -8 FROM DUAL UNION ALL
  5  SELECT 4 , '2007-01-04' , 20 FROM DUAL)
  6  SELECT ID, DT, DECODE(SIGN(VAL),1,VAL,0,VAL,NULL) Positive,
  7         DECODE(SIGN(VAL),-1,VAL,NULL) Negative
  8* FROM TMP_QRY
  9  /
        ID|DT        |  POSITIVE|  NEGATIVE
----------|----------|----------|----------
         1|2007-01-02|        10|
         2|2007-01-02|          |        -5
         3|2007-01-03|          |        -8
         4|2007-01-04|        20|
SQL> Regards
Avinash