MYSQL视图groupby

Question

Below is the cutomerOrdersByName View: 
# Returns total for each order ordered from largest to smallest.

DROP VIEW IF EXISTS customerOrdersByName;

CREATE VIEW customerOrdersByName AS
    SELECT d.orderNumber
         , customerName
         , round(SUM(quantityOrdered * priceEach),2) total
      FROM orderDetails d
INNER JOIN orders o ON o.orderNumber = d.orderNumber
INNER JOIN customers c ON c.customerNumber = o.customerNumber
  GROUP BY customerName
  ORDER BY total DESC;

如何修改customerOrdersByName视图，以便按客户名称对总计进行分组和排序，然后按总计从最高到最低排序？

Answer 1

通过修改order by子句：

GROUP BY customerName
ORDER BY customerName asc, total DESC;

但是，我没有在选择列表中获得订单号。如果您没有对其进行分组，则还应将其从选择列表中删除。