用HAVING和GROUP BY获得总金额

Question

假设我有一个“订单”表，我必须打印花费超过100美元的客户名单。要做到这一点我使用具有和GROUP BY：

SELECT clientID, SUM(amount) AS spent 
FROM orders 
GROUP BY clientID 
HAVING spent >= 100; 

现在，我不知道是否在同一个查询可能获得通过所有这些客户谁花更多的100 $花费的总金额，总客户数/行。

• 约翰> $ 125
• DOE> $ 100
• TOTAL> $ 225（2的客户端）

Answer 1

WITH ROLLUP是你的朋友。

SELECT clientID, SUM(amount) AS spent 
FROM orders 
GROUP BY clientID 
WITH ROLLUP 
HAVING spent >= 100; 

Answer 2

的ANSI SQL-92标准的方法：

SELECT clientID, SUM(amount) AS spent 
FROM orders 
GROUP BY clientID 
HAVING SUM(amount) >= 100; 

的WITH ROLLUP方法将产生具有空clientID的一个行和sum(amount)所有的ClientID

MySQL也将支持：

SELECT clientID, SUM(amount) AS spent 
FROM orders 
GROUP BY clientID 
HAVING spent >= 100; 

要真正回答这个问题问：

SELECT clientID, SUM(spent) as spent 
FROM (
    SELECT clientID, SUM(amount) AS spent 
    FROM orders 
    GROUP BY clientID 
    HAVING spent >= 100 
) 
GROUP BY clientID 
WITH ROLLUP;