MySQL query inc AVG - mysql

Question

after a bit of help please :)
The following MySQL query
select id, customer_id, user,
(((q_responce_time + o_responce_time + cs_responce_time + q_accuracy +
o_accuracy + cs_accuracy + q_personnel + o_personnel + cs_personnel +
q_communication + o_communication + d_communication + cs_communication +
q_overall + qu_overall + o_overall + d_overall + cs_overall + profile +
glass + parts + roof + in_full + direct_delivery + damages + service)/125)*100) as total,
month(create_datetime) as posted_month
from cs_review_centre
Where
create_datetime >= '2013-01-01'
and create_datetime < '2013-10-31'
and customer_id = 26
order by posted_month, customer_id
produces the following result
"customer_id" | "user" |"total" |"posted_month"|
"26" | "co2_test" |"72.8000" | "7" |
"26" | "co2_test" |"60.8000" | "8" |
"26" | "Lisa" |"81.6000" | "9" |
"26" | "Lisa" |"84.0000" | "10" |
"26" | "Lisa" |"52.0000" | "10" |
what I want to achieve is when a posted_month contains a duplicate value I want to average the "total"
Any help would very greatly appreciated
Thanks

Answer 1

Just GROUP BY customer_id, user,posted_month and use AVG() function
select customer_id, user,
AVG(
(((q_responce_time + o_responce_time + cs_responce_time + q_accuracy +
o_accuracy + cs_accuracy + q_personnel + o_personnel + cs_personnel +
q_communication + o_communication + d_communication + cs_communication +
q_overall + qu_overall + o_overall + d_overall + cs_overall + profile +
glass + parts + roof + in_full + direct_delivery + damages + service)/125)*100)
) as AverageTotal,
month(create_datetime) as posted_month
from cs_review_centre
Where
create_datetime >= '2013-01-01'
and create_datetime < '2013-10-31'
and customer_id = 26
GROUP BY customer_id, user,posted_month
order by posted_month, customer_id

Answer 2

Try:
select id, customer_id, user,
avg((((q_responce_time + o_responce_time + cs_responce_time + q_accuracy +
o_accuracy + cs_accuracy + q_personnel + o_personnel + cs_personnel +
q_communication + o_communication + d_communication + cs_communication +
q_overall + qu_overall + o_overall + d_overall + cs_overall + profile +
glass + parts + roof + in_full + direct_delivery + damages + service)/125)*100)) as total,
month(create_datetime) as posted_month
from cs_review_centre
Where
create_datetime >= '2013-01-01'
and create_datetime < '2013-10-31'
and customer_id = 26
group by id, customer_id, user, month(create_datetime)
order by posted_month, customer_id