Added

top.sql

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+SELECT
+  description,
+  sku,
+  level2,
+  level3,
+  rev,
+  qty,
+  trend,
+  sum(rev) over (
+    partition by level2
+  ) theorder
+from
+  (
+    SELECT
+      ROW_NUMBER () OVER (
+        PARTITION BY level2
+        ORDER BY
+          SUM(revenue) DESC
+      ) rownum,
+      SUM(revenue) OVER (PARTITION BY level2) total,
+      description,
+      sku,
+      level2,
+      level3,
+      ROUND(SUM(revenue), 2) as rev,
+      SUM(quantity) as qty,
+      trend
+    FROM
+      (
+        select
+          *,
+          cast(past as float) / 3 as past,
+          round(
+            cast(present as float) /(cast(past as float) / 3.0),
+            2
+          ) as trend
+        from
+          (
+            select
+              *,
+              sum(quantity) FILTER (
+                WHERE
+                  year = 2021
+                  and month between 6
+                  and 8
+              ) over (PARTITION BY description) as past,
+              sum(quantity) FILTER (
+                WHERE
+                  year = 2021
+                  and month = 9
+              ) over (PARTITION BY description) as present
+            from
+              data
+          )
+      )
+    where
+      year = 2021
+      and month = 9
+    GROUP BY
+      description
+    ORDER BY
+      total DESC
+  )
+WHERE
+  rownum <= 10
+  and rev > 0
+order by
+  theorder desc;