Invalid Use Of Group Function - Max(`mainid`)+1
I am trying to insert a incremented number into the menu table. I will have an autoincremented number as well as the mainid number. When I tested the code that is below, the above error happened. Can someone please tell me the correct way of doing this? I am getting really frustrated with this. Nothing wants to work for me.
require "config.php";
$insert06 = "INSERT INTO `menu` (`mainid`)
VALUES (max(`mainid`)+1)"; // error line
if (mysql_query ($insert06)) {
print "Mainid added.";
$query2 = mysql_query("SELECT mainid FROM menu") or die ("Could not query because: ".mysql_error());
while($row2 = mysql_fetch_array($query2)) {
echo $row2['mainid']." = Mainid";
}
} else {
print "<p>Could not add the entry because: <b>" . mysql_error() . "</b>. The query was $insert06.</p>";
}
mysql_close();
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