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Update Task03：复杂一点的查询.md

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Task03：复杂一点的查询.md
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@ -307,9 +307,9 @@ SELECT product_id, product_name, sale_price
我们再来看一下这个需求`选取出各商品种类中高于该商品种类的平均销售单价的商品`。SQL语句如下： 我们再来看一下这个需求`选取出各商品种类中高于该商品种类的平均销售单价的商品`。SQL语句如下：
```sql ```sql
SELECT product_type, product_name, sale_price SELECT product_type, product_name, sale_price
FROM product ASp1 FROM product AS p1
WHERE sale_price > (SELECT AVG(sale_price) WHERE sale_price > (SELECT AVG(sale_price)
FROM product ASp2 FROM product AS p2
WHERE p1.product_type =p2.product_type WHERE p1.product_type =p2.product_type
GROUP BY product_type); GROUP BY product_type);
``` ```