php - MySQL: group on timestamp -

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i have messages table this:

enter image description here

and want group messages same timestamp secondary table. expected output this:

enter image description here

i'm using following script, reason isn't working:

<?php  $message = mysql_query("select * message group member_id"); while($row = mysql_fetch_array($message)) {     @mysql_query("insert message2                   values                 ('$row[time_recorded]','$row[member_id]',                  '$row[message]')"); }

use select *, group_concat(message separator ', ') message message group member_id in first selection.


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