How to add download link from database on custom page template?

/*you're expecting a single row result so better use $wpdb->get_row
..$id I guess it's numeric so dont'use quote*/

global $wpdb;
$download = $wpdb->get_row("SELECT realname FROM odm_data where id=".$id); 

<a href="https://wordpress.stackexchange.com/questions/308676/download.php?file=<?php echo $download->realname ?>">Download</a>

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