please correct the error
 

select deptno,sum(sal) as tsal
from scott.emp a
group by a.deptno
having job in 'salesman' and 'clerk;

Re: please correct the error
 

corrected by myself

select deptno, sum(sal) as tsal
from scott.emp a
where job in ('SALESMAN','CLERK')
group by a.deptno;