How to show data in a matrix form from a table using SQL

Dear Friends,
I have a table with three columns with the following data:
Market, Product, Date, Value
Market-A Product-A 01/01/04 34
Market-A Product-A 01/02/04 33
Market-A Product-A 01/03/04 67
Market-A Product-A 01/04/04 64
Market-A Product-B 01/01/04 34
Market-A Product-B 01/02/04 36
Market-A Product-B 01/03/04 77
Market-A Product-B 01/04/04 32
Market-B Product-C 01/01/04 25
Market-B Product-C 01/02/04 56
Market-B Product-C 01/03/04 45
Market-B Product-C 01/04/04 68
Market-B Product-D 01/01/04 78
Market-B Product-D 01/02/04 75
Market-B Product-D 01/03/04 32
Market-B Product-D 01/04/04 35
I have a requirement where in I have to filter the products based on market and then show in the following format on the screen:
After filtering based on Market-A (eg) the data should look like:
01/01/04 01/02/04 01/03/04 01/04/04
Product-A 34 33 67 64
Product-B 34 36 77 32
Kinldy suggest how can I write a query to get the data in this format using SQL
Thanks & Regards,
Vinay

scott@ORA92> -- test data:
scott@ORA92> SELECT * FROM a_table
2 /
Market-A Product-A 01/01/04         34
Market-A Product-A 01/02/04         33
Market-A Product-A 01/03/04         67
Market-A Product-A 01/04/04         64
Market-A Product-B 01/01/04         34
Market-A Product-B 01/02/04         36
Market-A Product-B 01/03/04         77
Market-A Product-B 01/04/04         32
Market-B Product-C 01/01/04         25
Market-B Product-C 01/02/04         56
Market-B Product-C 01/03/04         45
Market-B Product-C 01/04/04         68
Market-B Product-D 01/01/04         78
Market-B Product-D 01/02/04         75
Market-B Product-D 01/03/04         32
Market-B Product-D 01/04/04         35
scott@ORA92> -- query:
scott@ORA92> SELECT product,
2          SUM (DECODE (the_date, to_date ('01/01/2004', 'mm/dd/yyyy'), value)) AS "01/01/04",
3          SUM (DECODE (the_date, to_date ('01/02/2004', 'mm/dd/yyyy'), value)) AS "01/02/04",
4          SUM (DECODE (the_date, to_date ('01/03/2004', 'mm/dd/yyyy'), value)) AS "01/03/04",
5          SUM (DECODE (the_date, to_date ('01/04/2004', 'mm/dd/yyyy'), value)) AS "01/04/04"
6 FROM   a_table
7 WHERE market = 'Market-A'
8 GROUP BY product
9 /
Product-A         34         33         67         64
Product-B         34         36         77         32
scott@ORA92>

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