Dynamic Column Query

Question

Hi Friends,
Can you please help me in writing a query for :
YEAR PRODUCTION QLY_TYPE
1991 23 A
1991 12 B
1991 19 K
1992 23 A
1992 25 B
1992 23 K
1993 27 A
1995 12 B
1993 16 K
1994 42 A
1995 53 A
1994 40 A
Query : Statistics on total production for last 3 Years
( suppose user chooses 1994 --> for years 1994,1993,1992
suppose user chooses 1995 --> for years 1995,1994,1994)
OUT PUT should be as for 1994;
1994 1993 1992
82 43 71
i.e., Column Name should be the Year Values
Thanks in Advance.
-Dhanu

Answer 1

i have created a function for these..please check whether it's helpful for u or not
create or replace
function get_det( p_year in varchar2 )
return varchar2
is
l_str varchar2(2000) default null;
l_sep varchar2(1) default null;
begin
for x in ( WITH details AS (SELECT 1991 year,23 production, 'A' qly_type
FROM dual
UNION
SELECT 1991 ,12, 'B'
FROM dual
UNION
SELECT 1991, 19 ,'K'
FROM dual
UNION
SELECT 1992,23, 'A'
FROM dual
UNION
SELECT 1992, 25 ,'B'
FROM dual
UNION
SELECT 1992, 23 ,'K'
FROM dual
UNION
SELECT 1993, 27, 'A'
FROM dual
UNION
SELECT 1995, 12, 'B'
FROM dual
UNION
SELECT 1993 ,16, 'K'
FROM dual
UNION
SELECT 1994 ,42 ,'A'
FROM dual
UNION
SELECT 1995, 53, 'A'
FROM dual
UNION
SELECT 1994 ,40 ,'A'
FROM dual
select year,tot
from
(select year,sum(PRODUCTION)tot from details
group by year) a
where year in(p_year,p_year-1,p_year-2)
loop
l_str := l_str || l_sep || x.tot;
l_sep := ',';
end loop;
return l_str;
end;
SQL> select 1994,get_det(1994) from dual;
1994 GET_DET(1994)
1994 71,43,82
Thanks