Kill all sessions of a sql_id - oracle database script

SELECT 'alter system kill session ' ||''''||SID||','||SERIAL#||' immediate ;'
FROM v$session
WHERE sql_id='&sql_id'; --- FOR RAC  select 'alter system kill session ' ||''''||SID||','||SERIAL#||',@'||inst_id||''''||' immediate ;'  from gv$session where sql_id='&sql_id'