SQLQuokkaSQLQuokkaWalmart's pricing team wants to flag premium items: products priced strictly above the average unit price of their own category. Return `item_name`, `category`, `unit_price` and `category_avg_price` (that category's average price, rounded to 2 decimals) for every such item. Order the results by `category` ascending, then `unit_price` descending, then `item_id` ascending.
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