<p>You can you use the <a href="https://data.stackexchange.com/" rel="nofollow noreferrer">StackExchange Data Explorer</a> to write an SQL query that does exactly what you want. Below a query that returns what you are looking for. That is, unanswered posts, sorted from oldest to newest, that are not closed and contain the tags you will define in the parenthenses in the <code>t.TagName IN ('r', 'monte-carlo')</code> clause (I used 'r' and 'monte-carlo' just for example).</p>
<pre><code>select distinct p.Id AS [Post Link], p.*
from Posts p
  inner join PostHistory ph on ph.postid = p.id
  join PostTags pt ON pt.PostId = p.Id
  join Tags t  ON t.Id = pt.TagId
where p.PostTypeId = 1 and p.AnswerCount = 0 and ph.PostHistoryTypeId != 10 -- closed
and t.TagName IN ('r', 'monte-carlo')
order by p.CreationDate asc
</code></pre>
<p>Note that the site queried is not part of the query itself. You have to select it in the query configuration page by searching for the site you want.</p>
<p>You can use the above query already configured for the Cross Validated site <a href="https://data.stackexchange.com/stats/query/1402777/oldest-unanswered-questions-in-cross-validated-filtered-by-tags-and-sorted-oldes" rel="nofollow noreferrer">here</a> (allow it some seconds and it will probably execute automatically; if not just click &quot;Run Query&quot;). You may fork it and edit it as you like.</p>
<p>If you want to learn more about writing queries against the Stack Exchange Data Explorer, have a look into their <a href="https://data.stackexchange.com/tutorial" rel="nofollow noreferrer">tutorial</a>.</p>
