mysql - SQL 子查询问题

Question

我的问题是检索一家以高于平均市场价格出售每件商品的商店；

SELECT SHOP_NAME, Trade_Name
FROM SELL_ITEM f
WHERE PRICE >
  (SELECT
   AVG(PRICE)
   FROM SELL_ITEM s
   WHERE f.Trade_Name = s.Trade_Name
   GROUP BY TRADE_NAME);

此查询向我返回所有商店销售的商品 > 高于平均市场价格的商品，但我如何过滤掉那些不适合每个商品的商品？

Answer 1

已编辑...(第一次错过了细微差别)

SELECT shop_name FROM
(
    SELECT shop_name, MIN(case when f.price > a.avg_price then 1 else 0 end) AS is_always_higher_than_avg
    FROM SELL_ITEM f 
    INNER JOIN 
    (
        SELECT avg(price) AS avg_price, trade_name
        FROM sell_item
        GROUP BY trade_name
    ) a
    ON f.trade_name = a.trade_name
    WHERE f.price > a.avg_price
    GROUP BY shop_name
) b
WHERE is_always_higher_than_avg = 1