Question

I’m working on my project now but I have encountered some problems :/
My method is supposed to gather information from the database and then count the average. This is what I get so far:

Rate: 4
Food_Food_ID: 2
------------
Rate: 4
Food_Food_ID: 2
------------
Rate: 2
Food_Food_ID: 2
------------
Rate: 12
Food_Food_ID: 2
------------
Rate: 5
Food_Food_ID: 4
------------
Rate: 10
Food_Food_ID: 4
------------
Average: 6.166666666666667

(This is the average of all the Rates :/ )

But I’m trying to get:

Rate: 22
Food_Food_ID: 2
Average: 5.5

------------
Rate: 15
Food_Food_ID: 2
Average: 7.5
------------

It should add all of the rating and then count the average of the rating. I hope I explained it good 🙂

Here is the code: http://pastebin.com/zUdF9HwF

First time posting here, hope I did okey. And thanks for the help 😀

Answer 1

This is what SQL was invented for, see:

SELECT user.Food_Food_ID, AVG(user.Rate)
FROM user 
     INNER JOIN food ON user.Food_Food_ID = food.Food_Food_ID
GROUP BY user.Food_Food_ID

No loops, no counting, just one SQL and you get the results.