1.查询至少购买了“李思静”所购买的全部商品的客户信息,可否转换为集合查询?如果能,请用集合查询实现,如果不能请说明理由。
时间: 2024-05-07 11:17:56 浏览: 129
可以转换为集合查询。以下为集合查询实现:
```
SELECT DISTINCT customer_info.*
FROM customer_info
WHERE customer_info.customer_id IN (
SELECT order_info.customer_id
FROM order_info
WHERE order_info.product_id IN (
SELECT order_info_2.product_id
FROM order_info AS order_info_2
WHERE order_info_2.customer_id = (
SELECT customer_info_2.customer_id
FROM customer_info AS customer_info_2
WHERE customer_info_2.customer_name = '李思静'
)
)
GROUP BY order_info.customer_id
HAVING COUNT(DISTINCT order_info.product_id) >= (
SELECT COUNT(DISTINCT order_info_3.product_id)
FROM order_info AS order_info_3
WHERE order_info_3.customer_id = (
SELECT customer_info_3.customer_id
FROM customer_info AS customer_info_3
WHERE customer_info_3.customer_name = '李思静'
)
)
)
```
其中,最内层子查询获取了名为“李思静”的客户的ID,然后通过查询订单表获取了该客户购买的所有商品ID。中间一层子查询通过对订单表进行分组统计,获取了所有购买了与“李思静”购买的所有商品的客户ID。最外层查询用这些客户ID查询客户信息表,获取了所有符合要求的客户信息。
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