diff --git a/slides/cse4562sp2018/2018-01-31-SQL+Physical.html b/slides/cse4562sp2018/2018-01-31-SQL+Physical.html
index 6a994b69..f369dfc5 100644
--- a/slides/cse4562sp2018/2018-01-31-SQL+Physical.html
+++ b/slides/cse4562sp2018/2018-01-31-SQL+Physical.html
@@ -369,6 +369,19 @@
             <dd>A primitive value (for now)</dd>
           </dl>
         </section>
+
+        <section>
+          <svg data-src="graphics/2018-01-29-db_as_mediator.svg" />
+        </section>
+
+        <section>
+          <pre><code class="python">
+  with db_open('Trees') as data:
+    for record in data:
+      if(records['BORONAME'] == 'Brooklyn'):
+        print(fields['TREE_ID']);
+          </code></pre>
+        </section>
       </section>