查找不共享关系的记录

Question

  

可能重复：
  SQL - find records from one table which don’t exist in another

我在MySQL中有以下（简化）架构：

箭头表示一个（非箭头侧）到多个（箭头侧）关系。

我想确定，对于哪个delivery_zone_weeks，客户没有每周订单。

Answer 1

如果没有结构，样本数据和预期结果，很难完全理解，但似乎有点冒险你需要

SELECT * FROM DELIVERY_ZONE_WEEK WHERE ID_DELIVERY_ZONE_WEEK NOT IN
(SELECT WO.ID_DELIVERY_ZONE_WEEK FROM CUSTOMER C
JOIN SHIPPING_ADDRESS SA
    ON C.ID_CUSTOMER = SA.ID_CUSTOMER
JOIN WEEKLY_ORDER WO
    ON SA.ID_SHIPPING = WO.ID_SHIPPING
WHERE C.ID_CUSTOMER = @ID_CUSTOMER)