PHPで指定した情報に従って、別のデータベースの同じ行の情報を検索する方法

<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 name="rexm_pcid" id="rexm_pcid"><br>
                                                  
$query2=mssql_query("select * from tb_xmpc");<br>
                                                                   
while($myrow2=mssql_fetch_array($query2)){<br>
$ 選択 = $ MyRow2 [xmpc_id] == $ xmpc_id? '選択 = "選択"': ':';
?><br>
<option value="<?php echo $myrow2[xmpc_id];?>" <?php echo $selected;?>><?php echo $myrow2[xmpc_expr];?>< /オプション><br>