Question

This is example of the problem i am having. The query should return rows paul and rick because they have the highest rating of the child rows. Instead the query is returning dave and owen, my guess is because they are the first child rows. I am grouping by position and using MAX(child.rating) but the query isn’t working like i want it to be. In the real table i have alot of columns that is why i use child.* in the select clause.

mytable

  id |  name | parentid|  position| rating  |
   1 |  mike |    1    |    1     |    6    |
   2 |  dave |    1    |    2     |    5    |
   3 |  paul |    1    |    2     |    7    |
   4 |  john |    1    |    2     |    3    |
   5 |  mike |    5    |    1     |    8    |
   6 |  owen |    5    |    2     |    2    |
   7 |  rick |    5    |    2     |    9    |
   8 |  jaye |    5    |    2     |    3    |



$getquery = mysql_query("SELECT MAX(child.rating),child.* FROM mytable child 
        LEFT JOIN mytable parent on parent.parentid=child.parentid 
        WHERE parent.name LIKE '%mike%' GROUP BY child.position,child.parentid");



while($row=mysql_fetch_assoc($getquery)) {

 $id = $row['id'];
 $name = $row['name'];
 $parentid = $row['parentid'];



if($id==$parentid) {
    continue;
    }
echo "<p>Name: $name </p>";

}

Answer 1

Funny thing, I’ve just realized what you’re looking for. Here is the final query:

select t1.* from mytable t1
left join mytable t2
on t1.parentid = t2.parentid and t1.rating < t2.rating
join mytable parents
on parents.id = t1.parentid
where t2.rating is null and parents.name like '%mike%'

And here is a working example