diff --git a/_includes/sqlstyle.guide.md b/_includes/sqlstyle.guide.md
index 71bd29c..b5c8f36 100644
--- a/_includes/sqlstyle.guide.md
+++ b/_includes/sqlstyle.guide.md
@@ -176,11 +176,23 @@ the readers eye to scan over the code and separate the keywords from the
 implementation detail. Rivers are [bad in typography][rivers], but helpful here.
 
 ```sql
-SELECT f.average_height, f.average_diameter
-  FROM flora AS f
- WHERE f.species_name = 'Banksia'
-    OR f.species_name = 'Sheoak'
-    OR f.species_name = 'Wattle';
+(SELECT f.species_name,
+        AVG(f.height) AS average_height, AVG(f.diameter) AS average_diameter
+   FROM flora AS f
+  WHERE f.species_name = 'Banksia'
+     OR f.species_name = 'Sheoak'
+     OR f.species_name = 'Wattle'
+  GROUP BY f.species_name, f.observation_date)
+
+  UNION ALL
+
+(SELECT b.species_name,
+        AVG(b.height) AS average_height, AVG(b.diameter) AS average_diameter
+   FROM botanic_garden_flora AS b
+  WHERE b.species_name = 'Banksia'
+     OR b.species_name = 'Sheoak'
+     OR b.species_name = 'Wattle'
+  GROUP BY b.species_name, b.observation_date)
 ```
 
 Notice that `SELECT`, `FROM`, etc. are all right aligned while the actual column