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ORA-01858:

a non-numeric character was found where a numeric was expected
Cause: The input data to be converted using a date format model was incorrect. The input data did not contain a number where a number was required by the format model.
Action: Fix the input data or the date format model to make sure the elements match in number and type. Then retry the operation.
 SubjectReplies
1.SQL*Loader Date error (ORA-01858)1
2.SQL*Loader Date error (ORA-01858)1