Query date error

Question

Hi,
I have the following query and it works fine:
SELECT partition_name, TO_DATE(SUBSTR(partition_name,-8), 'YYYYMMDD') dt, SUBSTR(partition_name,-8) pd
FROM all_tab_partitions
WHERE table_owner='TESTUSER'
AND table_name='ED_OPERATIONS_LOG';
PARTITION_NAME DT PD
EOL_20050113 13-JAN-05 20050113
EOL_20050114 14-JAN-05 20050114
EOL_20050115 15-JAN-05 20050115
EOL_20050116 16-JAN-05 20050116
EOL_20050117 17-JAN-05 20050117
EOL_20050118 18-JAN-05 20050118
If I add in the WHERE clause:
AND TRUNC(TO_DATE(SUBSTR(partition_name,-8), 'YYYYMMDD')) < TRUNC(SYSDATE)
I get this error:
AND TRUNC(TO_DATE(SUBSTR(partition_name,-8), 'YYYYMMDD')) < TRUNC(SYSDATE)
ERROR at line 6:
ORA-01841: (full) year must be between -4713 and +9999, and not be 0
WHY?
That conversion works fine as stated by the output above.
Please help.
Thanks
Tarek

Answer 1

SQL> show user
USER is "SYSTEM"
SQL> desc testuser.ed_operations_log
Name Null? Type
UC_USER_COD NOT NULL VARCHAR2(10)
MODULE_COD NOT NULL VARCHAR2(20)
FUNCTION_COD NOT NULL VARCHAR2(15)
OPERATION_DATE NOT NULL DATE
OPERATION_NUMBER NOT NULL NUMBER(8)
TP_OPERATION_STATUS_COD NOT NULL NUMBER(2)
PERSONID_INFO VARCHAR2(10)
PARAMSIN VARCHAR2(2000)
PARAMSOUT VARCHAR2(2000)
RETURN_COD NOT NULL NUMBER(8)
TIMESTAMP NUMBER(5)
SQL> SELECT partition_name, TO_DATE(SUBSTR(partition_name,-8), 'YYYYMMDD') dt, SUBSTR(partition_name,-8) pd
2 FROM all_tab_partitions
3 WHERE table_owner='TESTUSER'
4 AND table_name='ED_OPERATIONS_LOG';
PARTITION_NAME DT PD
EOL_20041212 12-DEC-04 20041212
EOL_20041213 13-DEC-04 20041213
EOL_20041214 14-DEC-04 20041214
EOL_20041215 15-DEC-04 20041215
EOL_20041216 16-DEC-04 20041216
EOL_20041217 17-DEC-04 20041217
EOL_20041218 18-DEC-04 20041218
EOL_20041219 19-DEC-04 20041219
EOL_20041220 20-DEC-04 20041220
EOL_20041221 21-DEC-04 20041221
EOL_20041222 22-DEC-04 20041222
EOL_20041223 23-DEC-04 20041223
EOL_20041224 24-DEC-04 20041224
EOL_20041225 25-DEC-04 20041225
EOL_20041226 26-DEC-04 20041226
EOL_20041227 27-DEC-04 20041227
EOL_20041228 28-DEC-04 20041228
EOL_20041229 29-DEC-04 20041229
EOL_20041230 30-DEC-04 20041230
EOL_20041231 31-DEC-04 20041231
EOL_20050101 01-JAN-05 20050101
EOL_20050102 02-JAN-05 20050102
EOL_20050103 03-JAN-05 20050103
EOL_20050104 04-JAN-05 20050104
EOL_20050105 05-JAN-05 20050105
EOL_20050106 06-JAN-05 20050106
EOL_20050107 07-JAN-05 20050107
EOL_20050108 08-JAN-05 20050108
EOL_20050109 09-JAN-05 20050109
EOL_20050110 10-JAN-05 20050110
EOL_20050111 11-JAN-05 20050111
EOL_20050112 12-JAN-05 20050112
EOL_20050113 13-JAN-05 20050113
EOL_20050114 14-JAN-05 20050114
EOL_20050115 15-JAN-05 20050115
EOL_20050116 16-JAN-05 20050116
EOL_20050117 17-JAN-05 20050117
EOL_20050118 18-JAN-05 20050118
38 rows selected.
SQL> SELECT partition_name, TO_DATE(SUBSTR(partition_name,-8), 'YYYYMMDD') dt, SUBSTR(partition_name,-8) pd
2 FROM all_tab_partitions
3 WHERE table_owner='TESTUSER'
4 AND table_name='ED_OPERATIONS_LOG'
5 AND TO_DATE(SUBSTR(partition_name,-8), 'YYYYMMDD') < SYSDATE;
AND TO_DATE(SUBSTR(partition_name,-8), 'YYYYMMDD') < SYSDATE
ERROR at line 5:
ORA-01841: (full) year must be between -4713 and +9999, and not be 0