[42000][923] Ora00923: From Keyword Not Found Where Expected

ora 923What causes an ORA-00923 error? In a SELECT or REVOKE statement, the keyword FROM was either missing, misplaced, or misspelled. The keyword FROM must followI have been getting the error ORA-00923: FROM keyword not found where expected and do not know why, please help. Do check for missing spaces in the sql query. I ran into another