ขอสอบถามเกี่ยวกับการนำค่าจากตัวแปรที่กำหนดไว้ไปเปรียบเทียบกับข้อมูลในฐานข้อมูล sql ค๊ะ

<table width="300" border="0" align="center" cellpadding="0" cellspacing="1">
<tr>
<td><form name="form1" method="post" action="insert_ac.php">
<table width="100%" border="0" cellspacing="1" cellpadding="3">
<tr>
<td width="71">Name</td>
<td width="6">:</td>
<td width="301"><input name="name" type="text" id="name"></td>
</tr>
<tr>
<td>color</td>
<td>:</td>
<td><input name="color" type="text" id="color"></td>
</tr>
<tr>
<td>number</td>
<td>:</td>
<td><input name="number" type="text" id="number"></td>
</tr>
<tr>
<td colspan="3" align="center"><input type="submit" name="Submit" value="OK"></td>
</tr>
</table>
</form>
</td>
</tr>
</table>

<?php

$host="localhost"; // Host name 
$username=""; // Mysql username 
$password=""; // Mysql password 
$db_name="test"; // Database name 
$tbl_name="test1"; // Table name 

// Connect to server and select database.
mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");

// Get values from form 
$name=$_POST['name'];
$color=$_POST['color'];
$number=$_POST['number'];

// Insert data into mysql 
$sql="INSERT INTO $tbl_name(name, color, number)VALUES('$name', '$color', '$number')";
$result=mysql_query($sql);

// if successfully insert data into database, displays message "Successful". 
if($result){
echo "Successful";
echo "<BR>";
echo "<a href='insert.php'>Back to main page</a>";

<<<<<<<<<<  แทรกโค๊ด เปรียบเทียบ กับ Table : test2  >>>>>>>>>>

}

else {
echo "ERROR";
}
?> 

<?php 
// close connection 
mysql_close();
?>