oracle - ORA-00979: not a GROUP BY expression when sum(col) -

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select      invoicem.emp_no,     employees.emp_name,     invoicem.inv_no,     sum(invoicem.sum_amt),     invoicem.sal_date,     invoicem.branch invoicem join employees on invoicem.emp_no = employees.emp_no group invoicem.emp_no,emp_name

help me

you can select field in group statement or aggregation function in oracle:

select invoicem.emp_no,employees.emp_name,sum(invoicem.sum_amt) invoicem join employees on invoicem.emp_no = employees.emp_no group invoicem.emp_no,emp_name

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