ORA-00904: string: invalid identifier

HashFlare

ORA-00904: string: invalid identifier

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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