The "download CSV" shortcode has a hidden "query" field that accepts arbitrary SQL. Do not use this plugin unless you want your entire site owned, up to and including your database getting dropped. I'd be kinder, but... user-side SQL.
<input type="hidden" name="query" value="SELECT%20%2A%20FROM%20participants_database%20ORDER%20BY%20%60date_updated%60%20desc" />
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