М.б., это имеется ввиду
$q_first = sybase_query ("select * from oper..DB_space where DBS_Name = '$DBS_Names' and DBS_Date = '$DBS_Date_first'", $conn);
$q_last = sybase_query ("select * from oper..DB_space where DBS_Name = '$DBS_Names' and DBS_Date = '$DBS_Date_last'", $conn);
while ($row = sybase_fetch_assoc($q_last))
{
$row2 = sybase_fetch_assoc($q_first );
...
}
...