Oracle : Ошибка ORA-01859

"a non-alphabetic character was found where an alphabetic was expected"
*Cause: The input data to be converted using a date format model was
incorrect. The input data did not contain a letter where a letter 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.

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