Problem in Matrix Like Select Statement.

Question

Hi All,
I have table like this
Name Null? Type
ROLL NUMBER
DD DATE
ATT VARCHAR2(2)
Along with the data--
SELECT * FROM ATT;
ROLL DD AT
2 02-FEB P
2 01-FEB P
2 03-FEB P
2 04-FEB P
2 05-FEB P
2 06-FEB P
2 07-FEB A
2 09-FEB A
1 01-FEB A
1 02-FEB P
1 03-FEB A
1 04-FEB A
1 05-FEB P
1 06-FEB P
1 07-FEB P
1 09-FEB P
I want to write the select statement which fetch the data in matrix like I shown below.
ROLL 01-FEB = 02-FEB = 03-FEB = 04-FEB
1 A P A A
2 P P P P
I tried with sub-queries but not working Any Help...
SKM

Answer 1

sorry i did not look at the problem complete.
the first solution works with the number of values in the date columns are known.
then you can hardcode them , but when the values are unknown you should use something like this.
i have given my example, you just change the queries in the code accordingly and it works great. Thanks to Thomas Kyte who provided this example, i took it and modified for my own.
CREATE TABLE TABL_RESULTDATA
Loadpoints VARCHAR2(125)
, LoadPointSteps VARCHAR2(125)
, Variable VARCHAR2(125)
, Step NUMBER
, Value NUMBER
, VariableType VARCHAR2(20)
, ReadBackValue NUMBER
insert into tabl_resultdata values('HA_000_LP_000','S_001', 'AD1Out(ADcard_1)',1,5, 'SET', 10)
insert into tabl_resultdata values('HA_000_LP_000','S_001','N',1,100,'SET', 10)
insert into tabl_resultdata values('HA_000_LP_000','S_001','Load(DDE)',1,1,'SET', null)
insert into tabl_resultdata values('HA_000_LP_000','S_002','Q_quer(Emi2)',1,9.5,'MEAS', null)
insert into tabl_resultdata values('HA_000_LP_000','S_002','T_I(Emi2)',1,0,'MEAS', null)
insert into tabl_resultdata values('HA_000_LP_000','S_002','AD1Out(ADcard_1)',1,0,'SET', null)
insert into tabl_resultdata values('HA_000_LP_000','S_002','N',1,100,'SET', null)
insert into tabl_resultdata values('HA_000_LP_000','S_002','Load(DDE)',1,1,'SET', null)
insert into tabl_resultdata values('HA_000_LP_001','S_001','Q_Ueber(KMM)',1,49.83,'MEAS', null)
insert into tabl_resultdata values('HA_000_LP_001','S_001','T_Volkor(KMM)',1,0,'MEAS', null)
insert into tabl_resultdata values('HA_000_LP_001','S_001','C1(LeCroy)',1,0,'MEAS', null)
insert into tabl_resultdata values('HA_000_LPSCHL_000','S_001','AD1Out(ADcard_1)',1,10,'SET', null)
insert into tabl_resultdata values('HA_000_LPSCHL_000','S_001','AD1Out(ADcard_1)',2,12,'SET', 17)
insert into tabl_resultdata values('HA_000_LPSCHL_000','S_001','AD1Out(ADcard_1)',3,12,'SET', 19)
insert into tabl_resultdata values('HA_000_LPSCHL_000','S_001','AD1(ADcard_1)',1,9.025,'MEAS', null)
insert into tabl_resultdata values('HA_000_LPSCHL_000','S_001','AD1(ADcard_1)',2,9.05,'MEAS', null)
create or replace package pivot
as
type rc is ref cursor;
procedure data(p_cursor in out rc);
end;
create or replace package body pivot
as
procedure data( p_cursor in out rc )
is
l_stmt long;
l_index number := 0;
begin
l_stmt := 'select loadpoints, loadpointsteps ,step ';
for x in ( select distinct variable, variabletype from tabl_resultdata order by 2 )
loop
l_index := l_index + 1;
l_stmt := l_stmt ||', max(decode(variable,' || ''''|| x.variable||''''||', value )) ' ||replace(replace(x.variable||'('||x.variabletype||')', '('), ')');
end loop;
l_stmt := l_stmt || ' from tabl_Resultdata group by loadpoints,loadpointsteps, step order by loadpoints';
open p_cursor for l_stmt;
end;
end;
set linesize 198
column loadpoints format a17
column loadpointsteps format a5
column step format 999
column value_1 format 999.999
column value_2 format 999.999
column value_3 format 999.999
column value_4 format 999.999
column value_5 format 999.999
column value_6 format 999.999
column value_7 format 999.999
column value_8 format 999.999
column value_9 format 999.999
variable x refcursor
set autoprint on
exec pivot.data( :x );