MySQL鏈接表中的年齡大於6個月

Question

我有一個訂單表，其中包含客戶編號和完成日期。我試圖運行查詢來查看哪些客戶未訂購6個月。我試過如下：

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

，但我得到一個

[錯誤] 1111 - 無效使用組功能的

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 

要麼

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