Cant work out greater than date .. help plz

Question

Hi,
Can any one tell me why this TRUNC (SYSDATE)+ (rmt.sys_time_mon - TO_DATE ('01-JAN-1900', 'DD-MON-YYYY')) is not working.
If i run it seperately it gives me the appropriate value. This is a date value for example the date i have is 30/12/1899 1:00:00 AM.
Please help..
SELECT DPN.PAS_NAME,
     PPC.PROCESS_DES_CODE,
     MIN(decode(FCD.SOURCE_FILE_NAME, NULL, 'N', 'Y')),
     MIN(PCD.END_PROCESS_CONTROL_TSTP)
FROM DWCNTL_PAS_FILES_CODE PFC LEFT OUTER JOIN
DWCNTL_IFACE_FILE_CONTROL FCD ON SUBSTR(FCD.SOURCE_FILE_NAME, 1,7) = PFC.FILE_NAME AND TRUNC(FCD.CREATE_TSTP) =trunc(sysdate),
DWCNTL_PAS_NAME DPN JOIN
DWCNTL_PAS_PROCESS_CODE PPC ON PPC.PAS_ID = DPN.PAS_ID LEFT OUTER JOIN
DWCNTL_PROCESS_CONTROL PCD ON PCD.PROCESS_CODE = PPC.PROCESS_CODE AND trunc(PCD.END_PROCESS_CONTROL_TSTP) > TRUNC (SYSDATE)+ (rmt.sys_time_mon - TO_DATE ('01-JAN-1900', 'DD-MON-YYYY')) JOIN
SLA SLA ON SLA.PAS_ID = DPN.PAS_ID,
PROCESS_START PST ,
REPORT_COMMENTS RPT,
EDWAPPS_TIME RMT
WHERE PFC.FILE_NAME LIKE 'U2%'
AND DPN.PAS_NAME LIKE 'U2'
AND PFC.PROCESS_CODE = PPC.PROCESS_CODE
AND PPC.PROCESS_DES_CODE LIKE 'CONTRACT'
GROUP BY PPC.PROCESS_DES_CODE, DPN.PAS_NAME,PCD.END_PROCESS_CONTROL_TSTP

Answer 1

SELECT dpn.pas_name,
  ppc.process_des_code,
  MIN(decode(fcd.source_file_name, NULL, 'N', 'Y')),
  MIN(pcd.end_process_control_tstp)
FROM dwcntl_pas_files_code pfc
     LEFT OUTER JOIN dwcntl_iface_file_control fcd
          ON SUBSTR(fcd.source_file_name, 1, 7) = pfc.file_name
          AND TRUNC(fcd.create_tstp) = TRUNC(sysdate),
dwcntl_pas_name dpn
JOIN dwcntl_pas_process_code ppc
ON ppc.pas_id = dpn.pas_id
LEFT OUTER JOIN dwcntl_process_control pcd
ON pcd.process_code = ppc.process_code
AND TRUNC(pcd.end_process_control_tstp) >
TRUNC(sysdate) + (rmt.sys_time_mon-to_date('01-JAN-1900','DD-MON-YYYY'))
     JOIN sla sla ON sla.pas_id = dpn.pas_id,
     process_start pst,
     report_comments rpt,
     edwapps_time rmt
WHERE pfc.file_name LIKE 'U2%'
AND dpn.pas_name LIKE 'U2'
AND pfc.process_code = ppc.process_code
AND ppc.process_des_code LIKE 'CONTRACT'
GROUP BY ppc.process_des_code,
  dpn.pas_name,
  pcd.end_process_control_tstpsomething wrong with your query, you are trying to left join dwcntl_pas_process_code ppc with dwcntl_process_control pcd that why oracle give error 904 because no rmt alias in that join.