How to Generate Dynamic Columns from SQL

Question

Hi Friends,
I want to create a data fromat like This
Showroom / date    01-01-09        02-01-09     03-01-09     04-01-09      05-01-09     06-01-09     07-01-09   
S1                           20                      10              09            90             90                  10            100
S2                           10                       1                1              2               6                    2             10
S3                            5                        7                 9             1               2                    3             12This Data is Just like Matriz Reports....................................
Here i Want to Generate Date column value Dynamically.....................is it possible through SQL
the values are Sales value for each showroom for diffrent date value
all sale,showroom and Date Column are in one Table......................
It should Generate date Dynamically depending on User VAlues./..............
Thanks in Advance

Answer 1

something to play with (not tested as I don't have database access)
declare
/* assuming table showroom_sales has columns a_showroom,a_date,a_sale */
  the_sql varchar2(32000) := 'select a_showroom';
  day_from date := to_date('20090101','yyyymmdd');
  day_till date := to_date('20090107','yyyymmdd');
begin
  for d in (select a_date from showroom_sales where a_date between day_from and day_till)
  loop
    the_sql := the_sql ||
               ',max(decode(a_date,to_date('''||to_char(d.a_date,'yyyymmdd')||''',''yyyymmdd''),a_sale,null)) "'||to_char(d.a_date,'dd-mm-rr')||'"'
  end loop;
  the_sql := the_sql || ' from showroom_sales group by a_showroom order by a_showroom ';
  dbms_output.put_line(the_sql);  /* to verify if query is correct or not */
end;the code above should generate something like (provided all those dates appear in your showroom_sales table)
select a_showroom,
       max(decode(a_date,to_date('20090101','yyyymmdd'),a_sale,null)) "01-01-09",
       max(decode(a_date,to_date('20090102','yyyymmdd'),a_sale,null)) "02-01-09",
       max(decode(a_date,to_date('20090103','yyyymmdd'),a_sale,null)) "03-01-09",
       max(decode(a_date,to_date('20090104','yyyymmdd'),a_sale,null)) "04-01-09",
       max(decode(a_date,to_date('20090105','yyyymmdd'),a_sale,null)) "05-01-09",
       max(decode(a_date,to_date('20090106','yyyymmdd'),a_sale,null)) "06-01-09",
       max(decode(a_date,to_date('20090107','yyyymmdd'),a_sale,null)) "07-01-09"
  from showroom_sales
group by a_showroom
order by a_showroom to be executed to get the result as required
Regards
Etbin