Problem with SUBSTR and GROUP BY

Question

Hi people...
I'm needing a little help with this case. I'm executing this SQL and got error ORA-01722. I've tried to use number columns, alias and the syntax below and always got error. My problem is the SUBSTR, without it I can run the SQL with no error.
SQL> ED
Gravou arquivo afiedt.buf
1 SELECT TO_CHAR(DATA,'DD/MM') AS DATA,
2 SUBSTR(TO_CHAR(DATA,'DAY'),1,3) AS DIA_SEM,
3 SUM(DECODE(TIPOBAIXA,1,1,0)) AS INST,
4 SUM(DECODE(TIPOBAIXA,1,0,1)) AS REM,
5 SUM(DECODE(TIPOBAIXA,1,1,0))-SUM(DECODE(TIPOBAIXA,1,0,1)) AS DIFF
6 FROM BAIXA
7 GROUP BY TO_CHAR(DATA,'DD/MM'), TO_CHAR(DATA,'DAY')
8* ORDER BY TO_CHAR(DATA,'DD/MM') DESC
SQL> /
GROUP BY TO_CHAR(DATA,'DD/MM'), TO_CHAR(DATA,'DAY')
ERRO na linha 7:
ORA-01722: invalid number
Somebody has an idea of how I can solve this?
Thanks,
Fabiano

Answer 1

SQL> create table baixa
  2  as
  3  select sysdate data, 1 tipobaixa from dual union all
  4  select sysdate - 1, 0 from dual union all
  5  select sysdate - 2, 1 from dual
  6  /
Tabel is aangemaakt.
SQL> SELECT TO_CHAR(DATA,'DD/MM') AS DATA
  2       , TO_CHAR(DATA,'DY') AS DIA_SEM
  3       , SUM(DECODE(TIPOBAIXA,1,1,0)) AS INST
  4       , SUM(DECODE(TIPOBAIXA,1,0,1)) AS REM
  5       , SUM(DECODE(TIPOBAIXA,1,1,0))-SUM(DECODE(TIPOBAIXA,1,0,1)) AS DIFF
  6    FROM BAIXA
  7   GROUP BY TO_CHAR(DATA,'DD/MM'), TO_CHAR(DATA,'DY')
  8   ORDER BY TO_CHAR(DATA,'DD/MM') DESC
  9  /
GROUP BY TO_CHAR(DATA,'DD/MM'), TO_CHAR(DATA,'DY')
FOUT in regel 7:
.ORA-01722: invalid number
SQL> select to_char(data,'dd/mm') as data
  2       , to_char(data,'DY') as dia_sem
  3       , sum(decode(tipobaixa,1,1,0)) as inst
  4       , sum(decode(tipobaixa,1,0,1)) as rem
  5       , sum(decode(tipobaixa,1,1,0))-sum(decode(tipobaixa,1,0,1)) as diff
  6    from baixa
  7   group by to_char(data,'dd/mm')
  8       , to_char(data,'DY')
  9   order by 1 desc
10  /
DATA  DI                                   INST                                    REM                           DIFF
05/01 VR                                      1                                      0                              1
04/01 DO                                      0                                      1                             -1
03/01 WO                                      1                                      0                              1
3 rijen zijn geselecteerd.Regards,
Rob.