Mysql根据Quarters计算增长

Question

我有一个包含两个表的数据库 - 公司和报告.我想计算从q1(第1季度)到第2季度(第2季度)的变化.我曾尝试使用(以下)子查询,但主查询失败...

FROM
    (SELECT revenue FROM reports WHERE quarter = 'q2' AND fiscal_year = 2018) AS q,
    (SELECT revenue FROM reports WHERE quarter = 'q1' AND fiscal_year = 2017) AS lq

这里是DB Fiddle,可以帮助您理解问题和架构:

https://www.db-fiddle.com/f/eE8SNRojn45h7Rc1rPCEVN/4

当前简单查询.

SELECT 
    c.name, r.quarter, r.fiscal_year, r.revenue, r.taxes, r.employees
FROM 
    companies c
JOIN
    reports r 
ON
    r.company_id = c.id
WHERE
    c.is_marked = 1;

预期结果(这是我需要的):

+---------+----------+----------------+----------+--------------+-----------+------------------+
|  Name   | Revenue  | Revenue_change |  Taxes   | Taxes_change | Employees | Employees_change |
+---------+----------+----------------+----------+--------------+-----------+------------------+
| ABC INC |    11056 | +54.77         | 35000.86 | -28.57%      |       568 | -32              |
| XYZ INC |     5000 | null           | null     | null         |        10 | +5               |
+---------+----------+----------------+----------+--------------+-----------+------------------+

我非常感谢您帮助构建此查询.提前致谢.

Answer 1

使用MySQL 8.0窗口函数:

WITH cte AS (
  SELECT c.name, quarter, fiscal_year
   ,revenue,100*(revenue-LAG(revenue) OVER s)/NULLIF(revenue,0) AS change_revenue
   ,taxes,100*(taxes-LAG(taxes) OVER s)/NULLIF(taxes,0) AS change_taxes
   ,employees,employees-LAG(employees) OVER s AS change_employees
  FROM companies c
  JOIN reports r ON r.company_id = c.id
  WINDOW s AS (PARTITION BY r.company_id ORDER BY fiscal_year, quarter)
)
SELECT *
FROM cte
WHERE quarter = 'Q2';  -- only to get specific quarter
-- comment this condition to get quarter to quarter comparison 

db <>小提琴演示

Answer 2

使用纯 SQL 很难得到结果。但我做到了。

执行以下sql。我希望您能获得有关此 SQL 的帮助。

select 
    qd2.name as Name,
    qd2.Revenue as Revenue,
    qd2.Revenue - qd1.Revenue as Revenue_Change,
    qd2.Taxes as Taxes,
    (qd2.Taxes - qd1.Taxes) * 100 / qd1.Taxes as Taxes_Change,
    qd2.Employees as Employees,
    (qd2.Employees - qd1.Employees) as Employees_Change
from 
    (
        SELECT 
            (@cnt := @cnt + 1) AS rowNumber, 
            c.name as name, 
            r.revenue as Revenue,
            r.taxes as Taxes,
            r.employees as Employees
        FROM 
            companies c
        JOIN
            reports r 
        CROSS JOIN (SELECT @cnt := 0) AS dummy
        ON
            r.company_id = c.id and
            r.quarter = "q2"
        order by name
    ) as qd2
    JOIN
    (
        SELECT 
            (@cnt2 := @cnt2 + 1) AS rowNumber, 
            c.name as name, 
            r.revenue as Revenue,
            r.taxes as Taxes,
            r.employees as Employees
        FROM 
            companies c
        JOIN
            reports r 
        CROSS JOIN (SELECT @cnt2 := 0) AS dummy
        ON
            r.company_id = c.id and
            r.quarter = "q1"
        order by name
    ) as qd1
    ON qd1.rowNumber = qd2.rowNumber

结果如下

Name    Revenue Taxes   Employees   Revenue_Change  Taxes_Change    Employees_Change
ABC INC 11056   35000.86    568 6056    -22.221798  -32
XYZ LLC 5000    null    10  null    null    5