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brownafroduck

12-29-2006 04:47 PM

Sum of values based on usergroupid, using two tables

I'm a webmaster relatively inexperienced with databases and mySQL, so I am looking for any sort of pointer in the right direction like this. I've attempted to write a few SUM statements (is that even what you call them? statements?) using resources around the web, but I just can't seem to get this right.

I have two tables user and userfield.

In the user table I have the userid and usergroupid values.
In the userfield table I have the userid and userfield16 (an integer value representing points) values.

I would like to total the userfield16 points based on the usergroupid and have this value displayed on the forumhome index.php.

Make sense?

Paul M

12-29-2006 06:09 PM

This should do you for the sql;

[sql]
SELECT usergroupid, SUM(userfield16) AS total FROM user
LEFT JOIN userfield USING (userid)
GROUP BY usergroupid
[/sql]

brownafroduck

12-29-2006 07:44 PM

Thanks for the quick reply!

I feel like I'm doing this completely incorrectly. This query gives me an array? Or what? I'm a complete noob at this, so here is my feeble attempt. I used the SQL that you gave me...

PHP Code:


		
			
$result= mysql_query("

                SELECT usergroupid, SUM(userfield16) AS total FROM " . TABLE_PREFIX . "user

                LEFT JOIN " . TABLE_PREFIX . "userfield USING (userid)

                GROUP BY usergroupid

                ") or die(mysql_error());

                

$points = mysql_fetch_array($result);



$group1= $points[0];

$group2= $points[1];

$group3= $points[2];

$group4= $points[3];

But I get this error...

Code:

Unknown column 'userfield16' in 'field list'

What am I doing wrong? What do I need to change? If I know that the usergroupid values that I need to sum up the points are 11, 12, 13, and 14, does that make it any easier? Is there perhaps some other approach that I can take to this with that knowledge?

Thanks!

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