Question

假设我有一个“订单”表，我必须打印花费超过100美元的客户列表。为此，我使用了HAVING和GROUP BY：

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

现在我想知道在SAME查询中是否可以获得花费超过100美元的所有客户以及客户/行总数所花费的总金额。

john＆gt; $ 125
doe＆gt; $ 100
TOTAL＆gt; 225 $（2客户）

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

ANSI SQL-92标准方法：

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

WITH ROLLUP方法会产生一行，其中包含null clientID和所有clientID中的sum(amount)

MySQL也支持：

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

回答实际问的问题：

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;

通过HAVING和GROUP BY获得总金额

2 个答案: