2 query's in 1

$sql = "
SELECT MAX(`nummer`) AS max, MIN(`nummer`) AS min
FROM `database` 
WHERE `ID`=".$_GET['a']."
LIMIT 1
";

$result = mysql_query($sql, $db_link);
$row = mysql_fetch_object($result);

if($row->max < $_GET['b']){
	$var = $row->max;
} elseif($row->min > $_GET['b']){
	$var = $row->min;
} else {
	$var = $_GET['b'];
}

$sql = "
SELECT *
FROM `database` 
WHERE `ID`=".$_GET['a']." AND `nummer`=".$var."
LIMIT 1
";

$result = mysql_query($sql, $db_link);
$row = mysql_fetch_object($result);

$sql = "
SELECT MAX(`nummer`) AS max, MIN(`nummer`) AS min
FROM `database` 
WHERE `ID`=".$_GET['a']."
LIMIT 1
";
 
$result = mysql_query($sql, $db_link);
$row = mysql_fetch_object($result);
 
if($row->max < $_GET['b']){
	$var = $row->max;
} elseif($row->min > $_GET['b']){
	$var = $row->min;
} else {
	$var = $_GET['b'];
}
 
$sql = "
SELECT *
FROM `database` 
WHERE `ID`=".$_GET['a']." AND `nummer`=".$var."
LIMIT 1
";
 
$result = mysql_query($sql, $db_link);
$row = mysql_fetch_object($result);

SELECT * FROM _tabel_
WHERE ID = ___hier_A___ 
    AND nummer = 
    (SELECT highest(lowest(MAX(nummer), ___hier_B___), MIN(nummer)) 
     FROM _tabel_ 
     WHERE ID = ___hier_A____)

SELECT * FROM _tabel_
WHERE ID = ___hier_A___ 
    AND nummer = 
    (SELECT highest(lowest(MAX(nummer), ___hier_B___), MIN(nummer)) 
     FROM _tabel_ 
     WHERE ID = ___hier_A____)

SELECT * FROM `tabel` WHERE `nummer` IN(
SELECT  MAX(`nummer`) AS max, MIN(`nummer`) AS min FROM `database` WHERE `ID`=$_GET['a'])

SELECT * FROM `tabel` WHERE `nummer` IN(
SELECT  MAX(`nummer`) AS max, MIN(`nummer`) AS min FROM `database` WHERE `ID`=$_GET['a'])