diff --git a/src/honeysql/format.clj b/src/honeysql/format.clj
index 7ff2220..7e28425 100644
--- a/src/honeysql/format.clj
+++ b/src/honeysql/format.clj
@@ -161,7 +161,9 @@
 
 (def default-clause-priorities
   "Determines the order that clauses will be placed within generated SQL"
-  {:select 50
+  {:with 30
+   :with-recursive 40
+   :select 50
    :insert-into 60
    :update 70
    :delete-from 80
@@ -416,3 +418,19 @@
 
 (defmethod format-clause :delete-from [[_ table] _]
   (str "DELETE FROM " (to-sql table)))
+  
+(defn cte->sql
+  [[cte-name query]]
+  (str (to-sql cte-name) " AS " (to-sql query)))
+
+(defmethod format-clause :with [[_ ctes] _]
+  (str "WITH " (comma-join (map cte->sql ctes))))
+
+(defmethod format-clause :with-recursive [[_ ctes] _]
+  (str "WITH RECURSIVE " (comma-join (map cte->sql ctes))))
+
+(defmethod format-clause :union [[_ maps] _]
+  (string/join " UNION " (map to-sql maps)))
+
+(defmethod format-clause :union-all [[_ maps] _]
+  (string/join " UNION ALL " (map to-sql maps)))
diff --git a/src/honeysql/helpers.clj b/src/honeysql/helpers.clj
index a0bf280..e94eae6 100644
--- a/src/honeysql/helpers.clj
+++ b/src/honeysql/helpers.clj
@@ -219,3 +219,15 @@
 (defn delete-from
   ([table] (delete-from nil table))
   ([m table] (build-clause :delete-from m table)))
+  
+(defmethod build-clause :with [_ m ctes]
+  (assoc m :with ctes))
+
+(defmethod build-clause :with-recursive [_ m ctes]
+  (assoc m :with-recursive ctes))
+
+(defmethod build-clause :union [_ m maps]
+  (assoc m :union maps))
+
+(defmethod build-clause :union-all [_ m maps]
+  (assoc m :union-all maps))