PHP怎么按照指定信息查找另一数据库中同一行的信息

<br />
$query2=mssql_query("select * from tb_xmpc where xm_pcid='$xmpc_id'");<br />
$temp=array();<br />
while($myrow2=mssql_fetch_array($query2)){<br />
    array_push($temp,$myrow2['xmpc_ecpr']);<br />
}<br />

<br />
<option selected="selected"><?php foreach($temp as $val){echo $val;}?></option><br />

<select><br>
      <?php   <br />
              $query2=mssql_query("select * from tb_xmpc");<br>
             <br>
              while($myrow2=mssql_fetch_array($query2)){<br>
               $selected=  $myrow2[xmpc_id]==$xmpc_id ? 'selected="selected"' : '';<br>
       ?><br>
           <option>" <?php  echo $selected;?>><?php  echo $myrow2[xmpc_expr];?>
</option>
<br>
                     <br>
       <?php        <div class="clear">
                 
              
              
        
            </select>