diff --git a/lesson_28/db/db_app/src/main/resources/queries/mercedesmathews.sql b/lesson_28/db/db_app/src/main/resources/queries/mercedesmathews.sql
new file mode 100644
index 000000000..7d50b7035
--- /dev/null
+++ b/lesson_28/db/db_app/src/main/resources/queries/mercedesmathews.sql
@@ -0,0 +1,26 @@
+SELECT
+    type,
+    COUNT(*) AS total
+FROM
+    media_items
+GROUP BY
+    type
+
+
+SELECT
+    SUM(pages) AS total_pages_checked
+FROM
+    checked_out_items a
+    JOIN media_items b ON b.id = a.item_id
+
+
+SELECT
+    g.email,
+    g.name,
+    GROUP_CONCAT(c.item_id) AS checked_out_items
+FROM
+    guests g
+LEFT JOIN
+    checked_out_items c ON g.email = c.email
+GROUP BY
+    g.email, g.name, g.type;