Hi, Since you're telling mysql "Avg(RawData) as Mn" the index in $myrow won't be "Avg(RawData)", it'll just be "Mn". Try printing the entire $myrow to find out what you're receiving from mysql: print "<pre>"; print_r($myrow); print "</pre>"; That will show you the keys that you should use. Jos -----Original Message----- From: Finner, Doug [mailto:Dfinner@xxxxxxxxxxxx] Sent: 02 May 2005 16:05 To: php-db@xxxxxxxxxxxxx Subject: Aggregate MySQL functions in html table via php - having problems I want to build a table that is populated from a MySQL query and have the table include some aggregate data (mean, sd, and cv). If I select 'avg(RawData) as Mn' - and then stuff Mn into the table - life is good. If I try and select just RawData and computed the mean and sd at the time the table is created, I get an error 'Unidentified index: avg(RawData) in <php file name> at line <where I try and do the avg and sd> The format used below that does not work came from a suggestion by Oli (the original suggestion used echo rather than printf, but it seems to me the concept should be identical - am I wrong here???). I have a working method so I am in good shape, I'm just trying to learn other ways to get the same result. Any tips or pointers are appreciated. Doug /////////////// Query for STATISTICAL data ///////////////////////////////// $sql = "SELECT RunID, ItemSN, RawDataDesc, ReasonRun, RawData, //note, I've tried with including and excluding RawData from this query - no change in the error Avg(RawData) as Mn, Std(RawData) as SD, //note, I've tried leaving this line in and taking it out - no change in the error. (Std(RawData)/Avg(RawData) * 100) as CV FROM $table Where RawData != 'Passed' and RawData != 'Failed' Group By RawDataDesc"; echo "<br><br>"; $result = mysql_query($sql, $link) or die(mysql_error()); echo "This is the statistical data report for Item: $table <br><br>"; echo "<table border=1>\n"; echo "<tr><td>RunID</td><td>ItemSN</td><td>RunReason</td><td>Desc</td> <td BGCOLOR='33FF99'>Mean</td><td BGCOLOR='99FFCC'>SD</td><td BGCOLOR='FFCC66'>CV</tr>\n"; while($myrow = mysql_fetch_assoc($result)) { printf("<tr><td>%s</td><td>%s</td><td>%s</td><td>%s</td> <td BGCOLOR='33FF99'>%.1f</td><td BGCOLOR='99FFCC'>%.2f</td><td BGCOLOR='FFCC66'>%.2f</tr>\n", $myrow['RunID'], $myrow['ItemSN'], $myrow['ReasonRun'], $myrow['RawDataDesc'], $myrow['Mn'], $myrow['SD'], $myrow['CV']); // this works fine every time //$myrow['avg(RawData)'], $myrow['std(RawData)'], $myrow['CV']); // this was suggested by someone on this list but returns Unidentified index: avg(RawData) in <php file name> at line <this line when uncommented and used } echo "</table>\n"; _______________________________________________________________________ This e-mail message has been sent by Kollsman, Inc. and is for the use of the intended recipients only. The message may contain privileged or confidential information. If you are not the intended recipient you are hereby notified that any use, distribution or copying of this communication is strictly prohibited, and you are requested to delete the e-mail and any attachments and notify the sender immediately. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
