SQL> select f.role from filmography 2 , 3 (select max(awards) as maxiawards,username from filmography 4 group by username)maxawards 5 where f.role=maxawards.role 6 and filmography.awards=maxawards.maxiawards; where f.role=maxawards.role * ERROR at line 5: ORA-00904: "MAXAWARDS"."ROLE": invalid identifier
(select max(awards) as maxiawards,username from filmography group by username)maxawardscYour MAXAWARDSC view only contains the MAXIAWARDS and USERNAME columns. Yet in line 5, you are looking for the ROLE column of this view. Since this column does not exist, you get the error. You'll have to include the ROLE column in the inline view.
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