MAN AHL interview

puzzles/interviews/man_AHL/sql_query.txt

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+I can imagine that the query should be something like this. But my SQL is not very good.
+
+SELECT
+  p.product_id as product_id,
+  p.name as name,
+  o.quantity as quantity
+FROM
+  product p
+  JOIN (
+    SELECT
+      product_id,
+      SUM(quantity) as quantity
+    FROM
+      order
+    WHERE
+      dispatch_date > DATEADD(year, -1, GETDATE())
+    GROUP BY
+      product_id
+  ) o ON o.product_id = p.product_id
+WHERE
+  p.available_from < DATEADD(month, -1, GETDATE())
+  AND o.quantity < 10
+