หนูขอโค๊ด Search แบบที่สามารถใช้ ดอกจัน * ได้ และ Search รวมทุกตารางได้ค่ะ

<?
include("connect.inc");
$strSQL = "SELECT table1_name FROM table1";
UNION
$strSQL = "SELECT table2_name FROM table2";
$objQuery = mssql_query($strSQL) or die ("Error Query [".$strSQL."]");
?>
<form name="frmSearch" method="GET" action="<?=$_SERVER['SCRIPT_NAME'];?>">
<table width="599" border="1">
<tr>
<th>Keyword
<input name="Keyword_a" type="text" id="Keyword_a" value="<?=$_GET["Keyword_a"];?>">
<input type="submit" value="Search"></th>
</tr>
</table>
</form>
<?
if($_GET["Keyword_a"] != "")
{
$strSQL = "SELECT  table1_name FROM table1  WHERE (table1_name LIKE '%".$_GET["Keyword_a"]."%' )  ";
UNION
$strSQL = "SELECT  table2_name FROM table2 WHERE (table2_name LIKE '%".$_GET["Keyword_a"]."%' )  ";
$objQuery = mssql_query($strSQL) or die ("Error Query [".$strSQL."]");
?>

<?
include("connect.inc");
$strSQL = "SELECT table1_name FROM table1 UNION SELECT table2_name FROM table2";
$objQuery = mssql_query($strSQL) or die ("Error Query [".$strSQL."]");
?>
<form name="frmSearch" method="GET" action="<?=$_SERVER['SCRIPT_NAME'];?>">
<table width="599" border="1">
<tr>
<th>Keyword
<input name="Keyword_a" type="text" id="Keyword_a" value="<?=$_GET["Keyword_a"];?>">
<input type="submit" value="Search"></th>
</tr>
</table>
</form>
<?
if($_GET["Keyword_a"] != "")
{
$strSQL = "SELECT  table1_name FROM table1  WHERE (table1_name LIKE '%".$_GET["Keyword_a"]."%' ) UNION SELECT  table2_name FROM table2 WHERE (table2_name LIKE '%".$_GET["Keyword_a"]."%' )";
$objQuery = mssql_query($strSQL) or die ("Error Query [".$strSQL."]");
?>