ORA-23371: column string unknown in table string
ORA-19999 toORA-24279 15-43 Cause: Some column in"array_columns" argument (or "column_list" argument) to
"differences()" routine does not correspond to a column in thespecified table. Action: Make sure that allthe columns in either "array_columns" or "column_list"
are present in the specified table.