My SQL - Refer data from another table rows - mysql

Question

I have no idea whether it is possible or not.
I have two tables:
Columns in hospitals Table
hospitalID
Name
AverageRating
Columns in ratings Table
ID
rating1
rating2
rating3
rating4
rating5
rating6
hospitalID
rating1 to rating6 is types of ratings. Now By calculation I am able to get average rating of particular hospital in ratings table from following SELECT Query
SELECT IFNULL((SUM(charges) + SUM(behaviour) + SUM(admission) + SUM(properInformation)
+ SUM(hygine) + SUM(treatment))/(count(hospitalID) * 6), 0
) AverageRating,COUNT(ID) RatingCount
FROM ratings
WHERE hospitalID = '111111'
Above query works for me perfectly but this averageRating I also want to calculate in my hospitals table because I want to ranks hospitals.
Is there any functions in mySQL through which I can calculate average rating to hospitals table by referring ratings table.
Rating Table
Query Output Table

Answer 1

Based on the given table structure, you can try this.
EDIT
SELECT avgratings.*, #curRow := #curRow + 1 AS hospitalRank
FROM (
SELECT (SUM(r.`rating1`)+SUM(r.`rating2`)+SUM(r.`rating3`)+SUM(r.`rating4`)+SUM(r.`rating5`)+SUM(r.`rating6`))/(COUNT(r.`hospitalID`)*6) AS AverageRating, h.hospitalID
FROM hospitals h INNER JOIN ratings r
ON h.`hospitalID`=r.`hospitalID`
WHERE 1 GROUP BY r.`hospitalID`
) avgratings JOIN (SELECT #curRow := 0) rank
ORDER BY avgratings.AverageRating DESC
2nd Query to get rank of a particular hospital.
SELECT tablea.*
FROM (
SELECT avgratings.*, #curRow := #curRow + 1 AS hospitalRank
FROM (
SELECT (SUM(r.`rating1`)+SUM(r.`rating2`)+SUM(r.`rating3`)+SUM(r.`rating4`)+SUM(r.`rating5`)+SUM(r.`rating6`))/(COUNT(r.`hospitalID`)*6) AS AverageRating, h.hospitalID
FROM hospitals h INNER JOIN ratings r
ON h.`hospitalID`=r.`hospitalID`
WHERE 1 GROUP BY r.`hospitalID`
) avgratings JOIN (SELECT #curRow := 0) rank
) tablea
WHERE tablea.hospitalID=1 ORDER BY tablea.AverageRating DESC
Replace 1 in WHERE block with hospitalID.

Answer 2

I am not sure I understand your question...
You get the avarage of a single record with:
charges + behaviour + admission + properInformation + hygine + treatment / 6
You get the total avarage hence with:
avg(charges + behaviour + admission + properInformation + hygine + treatment / 6)
I order to get it per hospital, you'd group by hospital_id:
select
hospitalid,
avg(charges + behaviour + admission + properinformation + hygine + treatment / 6) as avr,
count(*) as rating_count
from ratings
group by hospitalid
order by 2 desc;
You can select the hospital data (e.g. the hospital name) along by joining the hospital table. E.g.
select
h.hospitalid,
h.name,
avg(r.charges + r.behaviour + r.admission +
r.properinformation + r.hygine + r.treatment / 6) as average_rating,
count(*) as rating_count
from hospitals h
left join ratings r on r.hospitalid = h.hospitalid
group by h.hospitalid
order by average_rating desc;