[PaLL3]

Ok, nu har jag kommit så här långt, tack Magnus...

$dsn = 'mysql:dbname=DBNAME;host=localhost';
$dbUser = 'USER';
$dbPassword = 'PASSWORD';

$dbh = new PDO($dsn, $dbUser, $dbPassword);

$res = $dbh->prepare('select count(itemID) as count, itemID from entity_attributes group by itemID having count <2');
$res->execute();

$result = $res->fetchAll(PDO::FETCH_COLUMN, 1);
$test = implode(' ',$result);
print_r($test);
//mysql_query("delete from entity_attributes where count(itemid) in ($test)");

$dbh = null;

Den visar enskilda itemID's men tyvärr inte bara dom med attributeID 280 resp 276.