Question

我有一个包含以下字段的订单表：id, name, price_paid

最简单的部分就是：

SELECT 
    name, 
    SUM(price_paid) AS total_price_paid 
FROM 
    Orders GROUP BY 
name

我应该如何修改我的SQL语句，以便在输出中获得以下内容？

name, total_price_paid, purchase_level

购买水平如下：

1如果total_price_paid在0 - 100
2，如果在101-350
和3如果超过350

提前谢谢。

Answer 1

使用条件总和：

SELECT 
  name, 
  SUM(IF(price_paid BETWEEN 0 AND 100, price_paid, 0)) AS sum_0_100,
  SUM(IF(price_paid BETWEEN 101 AND 350, price_paid, 0)) AS sum_101_350,
  SUM(IF(price_paid>350, price_paid, 0)) AS sum_350_plus
FROM 
  Orders 
GROUP BY 
  name

或者，等级：

SELECT 
  name,
  SUM(price_paid),
  CASE
    WHEN price_paid BETWEEN 0 AND 100 THEN 1
    WHEN price_paid BETWEEN 101 AND 350 THEN 2
    WHEN price_paid>350 THEN 3
  END AS level
FROM 
  Orders 
GROUP BY 
  name,
  -- don't forget group then:
  level

这两个查询之间的区别在于，fire会导致pivot，而second会导致普通行分组。

Answer 2

SELECT 
    name, 
    SUM(price_paid) AS total_price_paid,
    CASE WHEN SUM(price_paid) BETWEEN 0 AND 100 THEN 1
         WHEN SUM(price_paid) BETWEEN 101 AND 350 THEN 2
         WHEN SUM(price_paid) > 350 THEN 3 END AS purchase_level
FROM 
    Orders 
GROUP BY 
    name

MYSQL - 按名称分组的sum（字段）的附加分析

2 个答案: