MySQL - updating the average from one table into another table -


i'm mysql/php newbie , i'm sure simple question. i'm trying calculate average of several questions , respondents 1 table , updating group table value.

for example table answers consists of (name, group_id, taskclarity1, taskclarity2, taskclarity3) in table b want (group_id, avg(taskclarity1,taskclarity2,taskclarity3)).

this i've got...

$avg_task_clarity_1 = mysql_query("select avg(taskclarity1) gruppid = '$group_id'"); $avg_task_clarity_2 = mysql_query("select avg(taskclarity2) gruppid = '$group_id'"); $avg_task_clarity_3 = mysql_query("select avg(taskclarity3) gruppid = '$group_id'"); $avg_task_clarity = ($avg_task_clarity_1+$avg_task_clarity_2+$avg_task_clarity_3)/3; $print_task_clarity_1" update results set results.taskclarity = '$avg_task_clarity'";   if (mysql_query($print_task_clarity_1)) { echo $print_task_clarity_1; } else { echo "error taskclarity1: " . mysql_error();

first, mysql_query() returns resource, , need extract information it. query doesn't mantion table name (i'll call mytable). also, can 3 averages 1 query.

here's how start:

$table = "mytable"; $sql = "select avg(taskclarity1) avgclarity1,                avg(taskclarity2) avgclarity2,                avg(taskclarity3) avgclarity1         $table gruppid = '$group_id'";  $resource = mysql_query($sql);    //execute query  if (! $resource = mysql_query($sql) ){     echo "error reading table $table";     die; }  if (! mysql_num_rows($resource ) ){     echo "no records found in $table"; } else {     $row = mysql_fetch_assoc($resource);   // fetch first row     $avg_task_clarity_1 = $row['avgclarity1'];     $avg_task_clarity_2 = $row['avgclarity2'];     $avg_task_clarity_3 = $row['avgclarity3'];     $avg_task_clarity =         ($avg_task_clarity_1+$avg_task_clarity_2+$avg_task_clarity_3)/3;      //...     // other stuff want }

please comment if not helpful enough, , revise answer.


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