Display sum in matrix format

Question

Hi all,
I have a table contains data in following format
year style jan feb mar
2001 a 10 5 6
2002 a 5 5 6
2003 a 10 10 6
2004 a 5 6 6
for this detail I want to create view that should have a structure as following
style 2001 2002 2003 2004
a 21 16 26 17
any clue how I can achive this?

Answer 1

scott@ORA92> -- test table and test data:
scott@ORA92> SELECT * FROM your_table
  2  /
      YEAR S        JAN        FEB        MAR
      2001 a         10          5          6
      2002 a          5          5          6
      2003 a         10         10          6
      2004 a          5          6          6
scott@ORA92> -- create view:
scott@ORA92> CREATE OR REPLACE VIEW your_view AS
  2  SELECT style,
  3           SUM (DECODE (year, 2001, jan + feb + mar)) AS "2001",
  4           SUM (DECODE (year, 2002, jan + feb + mar)) AS "2002",
  5           SUM (DECODE (year, 2003, jan + feb + mar)) AS "2003",
  6           SUM (DECODE (year, 2004, jan + feb + mar)) AS "2004"
  7  FROM   your_table
  8  GROUP  BY style
  9  /
View created.
scott@ORA92> -- select from view:
scott@ORA92> SELECT * FROM your_view
  2  /
S       2001       2002       2003       2004
a         21         16         26         17