MySQL - Average % value from last day insertions - mysql

Question

I've got a table in MySQL:
+-----------------+-------------+------+-----+---------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+-------------+------+-----+---------------------+-------+
| period_duration | datetime | NO | PRI | 0000-00-00 00:00:00 | |
| duration | varchar(6) | YES | | NULL | |
| sample | varchar(2) | YES | | NULL | |
| corner | varchar(10) | YES | | NULL | |
| country | varchar(60) | NO | PRI | | |
| roaming_partner | varchar(60) | NO | PRI | | |
| pdp_in_total | int(8) | YES | | NULL | |
| pdp_in_ok | int(8) | YES | | NULL | |
| pdp_in_not_ok | int(8) | YES | | NULL | |
| pdp_in_ok_rate | int(8) | YES | | NULL | |
+-----------------+-------------+------+-----+---------------------+-------+
This table has new insertions hourly, that makes many different period_duration per roaming_partner:
+---------------------+----------+--------+----------+---------+-----------------------+--------------+-----------+---------------+----------------+
| period_duration | duration | sample | corner | country | roaming_partner | pdp_in_total | pdp_in_ok | pdp_in_not_ok | pdp_in_ok_rate |
+---------------------+----------+--------+----------+---------+-----------------------+--------------+-----------+---------------+----------------+
| 2014-12-16 14:00:00 | 3600 | 1 | GPRS_OUT | USA | Operator1 | 796 | 787 | 9 | 99 |
| 2014-12-16 15:00:00 | 3600 | 1 | GPRS_OUT | USA | Operator1 | 1748 | 1706 | 42 | 98 |
| 2014-12-16 16:00:00 | 3600 | 1 | GPRS_OUT | USA | Operator1 | 7 | 7 | 0 | 100 |
"ok_rate" is a percentage rate.
I need to create a SELECT that will show every single country, roaming_partner and pdp_in_ok_rate from the last 24 insertions, with the average pdp_in_ok_rate% from these insertions.
It is like i wanted that my SQL query say:
"This is the average pdp_in_ok_rate in the last 24 insertions for every operator on your table. Not in the whole table, but from these last ones."
Can someone please help me?

Answer 1

Does this do what you want?
select country, roaming_partner, avg(pd_in_ok_rate) as avgrate
from table t
where period_duration >= date_sub(now(), interval -1 day)
group by country, roaming_partner;
This doesn't give you the detail on the average. You can use this as a subquery, if you want the detail as well
select t.*, cr.avgrate
from table t join
(select country, roaming_partner, avg(pd_in_ok_rate) as avgrate
from table t
where period_duration >= date_sub(now(), interval -1 day)
group by country, roaming_partner
) cr
on t.country = cr.country and t.roaming_partner = cr.roaming_partner
where period_duration >= date_sub(now(), interval -1 day);