Function to get next Database ID

the bellow function will give you the next auto increament id of your database primary key.

function getNextID($field_id){
$db =& JFactory::getDBO();
$sql = "SELECT max(id) FROM jos_table WHERE field_name=$name";
$db->setQuery($sql);
$acl_num = $db->loadResult();
if($acl_num<>null){
return ($acl_num + 1);
}else{
return 0;
}
}

in reference to:

"Some time we need to see some string type data of different rows in comma separated or other separated in a single field. for this type of implementation mysql have a function GROUP_CONCAT(field_value) . we can add GROUP BY cluse to get comma separated values in different cases."
- Techinical tips for practical uses (view on Google Sidewiki)