| ORA-00904: | string: invalid identifier | | Cause: | The column name entered is either missing or invalid. | | Action: | Enter a valid column name. A valid column name must begin with a letter, be less than or equal to 30 characters, and consist of only alphanumeric characters and the special characters $, _, and #. If it contains other characters, then it must be enclosed in double quotation marks. It may not be a reserved word. |
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