feat: complex queries

app.py

@@ -70,14 +70,48 @@ def register():
 def bookings():
     email = session["user"]
 
+    user_visited_all = execute_sql(db, f'''
+            SELECT *
+            FROM users as u
+            WHERE NOT EXISTS (
+                SELECT h.id
+                FROM houses as h
+                EXCEPT                    
+                SELECT r.houseid
+                FROM rental as r
+                WHERE u.email=r.email
+            );                    
+            ''').__len__()
+
+    unique_booking_count = execute_sql(db, f'''
+            SELECT count(*)
+            FROM rental as r, houses as h
+            WHERE r.email = '{email}' AND h.id=r.houseid;
+            ''')[0]
+
+    unique_houses_not_booked = execute_sql(db, f'''
+            SELECT count(*)
+            FROM
+                (SELECT id
+                FROM houses
+                EXCEPT
+                SELECT r.houseid
+                FROM rental as r, houses as h
+                WHERE r.email = '{email}' AND h.id=r.houseid) as list
+            ;
+            ''')[0]
+
     rentals = execute_sql(db, f'''
             SELECT h.location, h.price, r.num_of_days, r.date
             FROM rental as r, houses as h
             WHERE r.email = '{email}' AND h.id=r.houseid
             ORDER BY r.date desc;
             ''')
     return render_template('bookings/index.html',
-                rents=rentals)
+                rents=rentals,
+                unique_booking_count=unique_booking_count,
+                unique_houses_not_booked=unique_houses_not_booked,
+                user_visited_all=user_visited_all)
 
 @app.route('/logout')
 @is_login

templates/bookings/index.html

@@ -5,6 +5,11 @@ <h1>{% block title %}Past bookings{% endblock %}</h1>
 {% endblock %}
 
 {% block content %}
+<p>There are a total of {{ user_visited_all }} users who booked all houses!!!</p>
+<p>You have booked a total of {{ unique_booking_count.count }} unique houses before</p>
+<p>You have a total of {{ unique_houses_not_booked.count }} unique houses to explore</p>
+<hr>
+
 <table>
     <thead>
         <td>Location</td>