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Question

我有2个表，一个是客户，另一个是订单

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这有效，但我想每年都这样做以获得这样的结果

SELECT customers.customer_name, orders.order_date
FROM customers
Left
Join orders on (customers.customer_id = orders.customer_id)
WHERE not orders.customer_id IN (SELECT customer_id from orders where Year(order_date) = Year(@Parameter1)) 
and not orders.order_date is null

Answer 1

天蝎座是正确的，你必须使用年份功能：

SELECT Year(orders.order_date), customers.customer_id 
FROM customers 
LEFT JOIN orders
ON (customers.customer_id = orders.customer_id) 
WHERE NOT orders.customer_id 
IN (
    SELECT customer_id 
    FROM orders 
    WHERE Year(order_date) = Year(@Parameter1)
) 
AND 
NOT orders.order_date is NULL

您可以在查询的SELECT部分中使用year方法

更新

要显示一年内未订购的所有客户，您不需要加入。您可以使用单个子选项执行此操作：

SELECT @Parameter1 AS Year, customer_id 
FROM customers 
WHERE customers.customer_id NOT IN (
    SELECT customer_id 
    FROM orders 
    WHERE Year(order_date) = Year(@Parameter1)
)

Answer 2

您需要一个列表，其中显示订单表中不的客户和年份。因此，获取所有客户的列表以及所有年份，然后减去您在订单表中找到的客户和年份：

select o.yr, c.customer_id
from customers c
cross join (select distinct year(order_date) as yr from orders) o
where (c.customer_id, o.yr) not in (select customer_id, year(order_date) from orders);

Mysql查询选择每年没有订单的客户

2 个答案:

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