Question

I Have two tables

1. Class table
2. notification table

class table contains all the details of classes likewise

classid | name
 1        myclass
 2        yourclass
 3        ourclass

and the notification table contains

noty_id | notificationname | class_id
  1         editing               1
  2         insertion             1
  3         answered              2
  4         answered updated      2
  5          deleted              3

Above table will yield the counts grouped by classid as given below

SELECT class_id, COUNT(*) AS classcnts FROM notification GROUP BY class_id

Now I want the class table to be displayed in the descending order of count obtained from notification table, how can i combine both queries to get the result.

Thanks In Advance

Answer 1

Try this:

SELECT cl.classid, cl.name, COUNT(no.notificationname) AS classcnts
FROM class cl LEFT JOIN notification no
ON cl.classid = no.class_id
GROUP BY cl.classid
ORDER BY classcnts DESC