php - Getting Data from 2 different MySQL tables -

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i'm working on project involved getting information 2 different servers. plan on doing having user enter or username password , have php script fill in rest of fields below first name last name etc. did searching , found of data have on 2 different tables within server. below coding have far. 

 <?php     $connect = mysql_connect("localhost","**************","**********") or die ("couldn't connect"); //host,username,password     mysql_select_db("*******") or die ("could not find database");      $query = mysql_query("select * jos_users username='$username'");       ?>     <html>     <form action="populate.php" method='post'>      <table>     <tr>             <td>vae&nbsp;username:</td>              <td><input type='text' name='username' value=''></td>           </tr>           <tr>             <td>vae&nbsp;password:</td>              <td><input type='password' name='password' value=''></td>           </tr>      </table>       <p><input type='submit' name='submit' value='search & populate!'></p> </form> //below information want filled in mysql tables     <hr>     $query = mysql_query("select * jos_users username='$username'");     <form action="dafreg.php" method='post'>     <table>     <tr>     <td>fristname:</td>     <td><input type='text' name='firstname' value='<?php echo $firstname; ?>'></td>     </tr>     <tr><td>lastname:</td>     <td><input type='text' name='lastname' value='<?php echo $lastname; ?>'></td>     </tr>     <tr>     <td>login:</td>     <td><input type='text' name='login' value='<?php echo $username; ?>'></td>     </tr>     <tr><td>password:</td>     <td><input type='text' name='pass' value=''></td>     </tr>     <tr><td>country:</td>     <td><input type='text' name='country' value=''></td>     </tr>     <tr><td>pilot:</td>     <td><input type='checkbox' name='pilot' value=''></td>     </tr>     <tr><td>atc:</td>     <td><input type='checkbox' name='atc' value=''></td>     </tr>     <tr><td>email:</td>     <td><input type='text' name='email' value=''></td>     </tr>      </table>      <p><input type='submit' name='submit' value='register'></p>      </form>          </form>       </html>

using 'join' best option extracting data multiple table...

select tab1.*,tab2.* table1 tab1 join table2 tab2 on tab1.id=tab2.id tab1.username=$username

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