Printing average-value from two tables with PHP/SQ

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Printing average-value from two tables with PHP/SQ

Author

Topic

ijjed
Starting Member

1 Post

Posted - 2012-01-30 : 11:48:03

Hi,

Firstly, these are my tables:

CLASS
class_id class_name
1 Donkeys
2 Monkeys
4 Classic
9 Humans

COURSES
class_id courses_number
9 6
9 2
1 3
2 2

I would like to print average course_number for each class_name.
So for class_name Donkeys would have average course_number 3.
And for clasS_name Humans, average course_number is 4.
If the class_name does not have any average number, it would still be listed. In this example, class_name Classic, would not be listed.

Do you get my point?

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2012-01-30 : 12:38:49

[code]
SELECT c.Class_name,COALESCE(cr.AvgCrs,0) AS AvgCrs
FROM CLASS c
LEFT JOIN (SELECT Class_id,AVG(courses_number*1.0) AS AvgCrs
FROM COURSES
GROUP BY Class_Id)cr
ON cr.Class_Id = c.Class_id
[/code]

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SQL Server MVP
http://visakhm.blogspot.com/

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