Oracle sql query : implementing an equation into a select group by -


i have following weighted average equation i'm trying put select clause

(( operating_hrsa * component counta ) + ( operating_hrsc * component countb ) + ( operating_hrsc * component countc )) / total compont_countabc

the select i'm trying put is: 

 select reporting_date_from,             reporting_date_to,             b_name,             oflag,             component_type,             sum (component_count) component_count,             --avg (average_operating_hours) average_operating_hours,             sum((average_operating_hours * component_count) / sum(component_count))  average_operating_hours          device        reporting_date_from = '01-jan-2017' , b_name '430%'     group reporting_date_from,             reporting_date_to,             b_name,             oflag,             component_type;

error i'm getting :

error @ line 1 ora-00937: not single-group group function

table schema : column | data type | null ? reporting_date_from date n reporting_date_to date n b_name varchar2(100 byte) y oflag varchar2(50 byte) y component_type varchar2(50 byte) y average_operating_hours number y

data sample data sample ideas i'm doing wrong calculation?
in advance

you use subselect result , perform calculation implies nested sum eg:

select  reporting_date_from,             reporting_date_to,             b_name,             oflag,             component_type,             component_count,              average_operating_hours,              my_value/component_count average_operating_hours   from(                  select reporting_date_from,               reporting_date_to,               b_name,               oflag,               component_type,               sum (component_count) component_count,               avg (average_operating_hours) average_operating_hours,               sum((average_operating_hours * component_count) )  my_value,           device          reporting_date_from = '01-jan-2017' , b_name '430%'       group reporting_date_from,               reporting_date_to,               b_name,               oflag,               component_type      )  t     ;

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