se non desideri un numero dinamico di colonne, dovresti eseguire questo approccio e utilizzare un tipo per contenere le colonne (poiché sql statico ha un numero fisso di colonne).
SQL> create table my_table (cy_name varchar2(3), ca_date date, ca_value number);
Table created.
SQL> alter session set nls_date_format='mm/dd/yyyy';
Session altered.
SQL> insert into my_table
2 select 'CUL' cy_name, to_date('1/4/2013') ca_date, 12 ca_value from dual
3 union all
4 select 'CUL' cy_name, to_date('12/31/2012') ca_date, 12 ca_value from dual
5 union all
6 select 'CUL' cy_name, to_date('1/3/2013') ca_date, 12 ca_value from dual
7 union all
8 select 'CUR' cy_name, to_date('1/6/2013') ca_date, 12 ca_value from dual
9 union all
10 select 'CUR' cy_name, to_date('12/6/2013') ca_date, 12 ca_value from dual;
5 rows created.
SQL>
SQL> drop type colTab;
Type dropped.
SQL> drop type colType;
Type dropped.
SQL> create type colType as object (colname varchar2(30), value number);
2 /
Type created.
SQL> create type colTab as table of colType;
2 /
Type created.
SQL> alter session set nls_date_format='mm/dd/yyyy';
Session altered.
SQL> col val format a80
SQL> set linesize 90
SQL> select cy_name,
2 cast(multiset(select ca_date, ca_value
3 from my_table d
4 where d.cy_name = a.cy_name) as coltab) val
5 from my_table a
6 group by cy_name;
CY_ VAL(COLNAME, VALUE)
--- --------------------------------------------------------------------------------
CUR COLTAB(COLTYPE('01/06/2013', 12), COLTYPE('12/06/2013', 12))
CUL COLTAB(COLTYPE('01/04/2013', 12), COLTYPE('12/31/2012', 12), COLTYPE('01/03/2013
', 12))
oppure genera prima l'SQL in modo dinamico... ad esempio:
SQL> select 'select CY_NAME, ' from dual
2 union all
3 select case when rownum != 1 then ',' end || str
4 from (select distinct 'MAX(DECODE(CA_DATE, TO_DATE(''' || to_char(ca_date, 'dd-mm-yyyy') || ''', ''DD-MM-YYYY''), CA_VALUE, NULL)) as "' || to_char(ca_date, 'dd-mm-yyyy
') || '"' str
5 from my_table a)
6 union all
7 select 'FROM MY_TABLE
8 GROUP BY CY_NAME; ' from dual
9 ;
'SELECTCY_NAME,'
------------------------------------------------------------------------------------------
select CY_NAME,
MAX(DECODE(CA_DATE, TO_DATE('04-01-2013', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "04-01-2013"
,MAX(DECODE(CA_DATE, TO_DATE('06-12-2013', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "06-12-2013"
,MAX(DECODE(CA_DATE, TO_DATE('31-12-2012', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "31-12-2012"
,MAX(DECODE(CA_DATE, TO_DATE('03-01-2013', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "03-01-2013"
,MAX(DECODE(CA_DATE, TO_DATE('06-01-2013', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "06-01-2013"
FROM MY_TABLE
GROUP BY CY_NAME;
7 rows selected.
ed eseguilo:
SQL> select CY_NAME,
2 MAX(DECODE(CA_DATE, TO_DATE('04-01-2013', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "04-01-2013"
3 ,MAX(DECODE(CA_DATE, TO_DATE('06-12-2013', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "06-12-2013"
4 ,MAX(DECODE(CA_DATE, TO_DATE('31-12-2012', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "31-12-2012"
5 ,MAX(DECODE(CA_DATE, TO_DATE('03-01-2013', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "03-01-2013"
6 ,MAX(DECODE(CA_DATE, TO_DATE('06-01-2013', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "06-01-2013"
7 FROM MY_TABLE
8 GROUP BY CY_NAME;
CY_ 04-01-2013 06-12-2013 31-12-2012 03-01-2013 06-01-2013
--- ---------- ---------- ---------- ---------- ----------
CUR 12 12
CUL 12 12 12
AGGIORNA alla tua modifica:se il numero di colonne nella tua modifica è 7:
SQL> select 'select CY_NAME, ' from dual
2 union all
3 select case when rownum != 1 then ',' end || str
4 from (select 'MAX(DECODE(CA_DATE, TO_DATE('''
5 || to_char((d-rownum+1), 'dd-mm-yyyy')
6 || ''', ''DD-MM-YYYY''), CA_VALUE, NULL)) as "'
7 || to_char((d-rownum+1), 'dd-mm-yyyy') || '"' str
8 from (select max(ca_date) d from cotton_arv) a
9 connect by level <= 7 /* change to the number of cols needed */)
10 union all
11 select 'FROM V_COTTON_ARV
12 GROUP BY CY_NAME; ' from dual
13 ;
'SELECTCY_NAME,'
------------------------------------------------------------------------------------------------
------------------------
select CY_NAME,
MAX(DECODE(CA_DATE, TO_DATE('04-01-2013', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "04-01-2013"
,MAX(DECODE(CA_DATE, TO_DATE('03-01-2013', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "03-01-2013"
,MAX(DECODE(CA_DATE, TO_DATE('02-01-2013', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "02-01-2013"
,MAX(DECODE(CA_DATE, TO_DATE('01-01-2013', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "01-01-2013"
,MAX(DECODE(CA_DATE, TO_DATE('31-12-2012', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "31-12-2012"
,MAX(DECODE(CA_DATE, TO_DATE('30-12-2012', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "30-12-2012"
,MAX(DECODE(CA_DATE, TO_DATE('29-12-2012', 'DD-MM-YYYY'), CA_VALUE, NULL)) as "29-12-2012"
FROM V_COTTON_ARV
GROUP BY CY_NAME;
