Question

我有一张订单表，其中包含客户编号和完成日期。我正在尝试运行查询以查看哪些客户未订购6个月。我尝试了以下方法：

SELECT DISTINCT
orders.Customer,
Max(orders.DateFinished)
FROM
orders
WHERE
DATEDIFF(CURDATE(), Max(orders.DateFinished)) > 180;
GROUP BY
orders.Customer

但是我得到了

[Err] 1111 - 无效使用群组功能

Answer 1

SELECT Customer,
       Max(DateFinished)
FROM orders
GROUP BY Customer
HAVING sum(DateFinished > CURDATE() - interval 180 day) = 0

Answer 2

try like this

SELECT DISTINCT orders.Customer, orders.DateFinished FROM orders 
WHERE DATEDIFF(CURDATE(), Max(orders.DateFinished)) > 180
GROUP BY orders.Customer,orders.DateFinished

OR

select DISTINCT orders.Customer, orders.DateFinished
  from orders
 where orders.DateFinished >= date_sub(orders.DateFinished, interval 6 month);

MySQL在链表中超过6个月

2 个答案: