Question

我有一个表，其中包含cust_id，sku，日期，order_number（如果是该客户的第一，第二...）和金额。我的最终目标是找到每个客户在第一年的总支出（确切的日期将相对于每个客户）。

销售数据表是rld_sales，其中包含以下列：

cust_id
sku，
购买日期
订单号（如果是客户的第一或第二...）

-- CREATES TABLE OF CUSTOMER_ID AND Y1, Y2 [END DATES]
CREATE TABLE customer_timetable AS (SELECT
    rld_sales. "customer_id" AS cust_id,
    CAST(date(rld_sales."date") + INTERVAL '1 year' AS DATE) as y1,
    CAST(date(rld_sales."date") + INTERVAL '2 year' AS DATE) as y2
FROM
    rld_sales
WHERE
    transaction_order = 1
GROUP BY
    rld_sales. "customer_id",
    date
);

-- JOINS CUSTOMER_TIMETABLE WITH RLD_SALES
CREATE TABLE t1 AS (
    SELECT
        customer_timetable.cust_id,
        customer_timetable.y1,
        customer_timetable.y2,
        rld_sales.*
    FROM
        customer_timetable
        JOIN rld_sales ON (customer_timetable.cust_id = rld_sales.customer_id)
);


SELECT
    t1. "cust_id",
    SUM(t1. "amount"),
    SUM(t2. "amount")
FROM
    t1
WHERE
    CAST(date AS DATE) BETWEEN y1
    AND y2
    LEFT JOIN (
        SELECT
            t1. "amount"
        FROM
            t1
        WHERE
            CAST(date AS DATE) > t1. "y2") t2 ON t1. "cust_id" = t2. "cust_id"
    GROUP BY
        t1. "cust_id"
        SELECT
            *
        FROM
            customer_timetable;

到目前为止，我一次创建中间表并连接一个表的成功很少，但是我觉得必须有一种更优雅的方法来使它们一次完成。

Answer 1

如果我猜您正在使用MySQL数据库，则以下查询将为您提供一些编写标准SQL的指南，以实现您的要求-

SELECT 
A.customer_id,
CASE 
    WHEN A."date" >= DATE_ADD(CAST(NOW() AS DATE), INTERVAL -1 YEAR) THEN 'Last_Year'
    WHEN A."date" >= DATE_ADD(CAST(NOW() AS DATE), INTERVAL -2 YEAR) THEN 'Last_Previous_Year'
    ELSE 'Before_That'
END 'Year',
SUM(amount) -- Not sure your amount in which table. Add Table Alias before the coulmn name if required
FROM rld_sales A
INNER JOIN customer_timetable B ON A.customer_id = B.cust_id 
GROUP BY 
A.customer_id,
CASE 
    WHEN A."date" >= DATE_ADD(CAST(NOW() AS DATE), INTERVAL -1 YEAR) THEN 'Last_Year'
    WHEN A."date" >= DATE_ADD(CAST(NOW() AS DATE), INTERVAL -2 YEAR) THEN 'Last_Previous_Year'
    ELSE 'Before_That'
END

要明智地获取每个列ID的年度值，请使用以下查询-

SELECT  A.customer_id,
SUM(CASE WHEN A."Year" = 'Last_Year'  THEN Amount ELSE 0 END) 'Last_Year',
SUM(CASE WHEN A."Year" = 'Last_Previous_Year'  THEN Amount ELSE 0 END) 'Last_Previous_Year',
SUM(CASE WHEN A."Year" = 'Before_That'  THEN Amount ELSE 0 END) 'Before_That'
FROM 
(
    SELECT 
    A.customer_id,
    CASE 
        WHEN A."date" >= DATE_ADD(CAST(NOW() AS DATE), INTERVAL -1 YEAR) THEN 'Last_Year'
        WHEN A."date" >= DATE_ADD(CAST(NOW() AS DATE), INTERVAL -2 YEAR) THEN 'Last_Previous_Year'
        ELSE 'Before_That'
    END 'Year',
    SUM(amount) Amount -- Not sure your amount in which table. Add Table Alias before the coulmn name if required
    FROM rld_sales A
    INNER JOIN customer_timetable B ON A.customer_id = B.cust_id 
    GROUP BY 
    A.customer_id,
    CASE 
        WHEN A."date" >= DATE_ADD(CAST(NOW() AS DATE), INTERVAL -1 YEAR) THEN 'Last_Year'
        WHEN A."date" >= DATE_ADD(CAST(NOW() AS DATE), INTERVAL -2 YEAR) THEN 'Last_Previous_Year'
        ELSE 'Before_That'
    END
)A
GROUP BY A.customer_id

Answer 2

我会这样写：

select s.customer_id, sum(s.amount)
from rld_sales s
where s.date < (select min(s2.date) + interval 1 year
                from rld_sales s2
                where s2.customer_id = s.customer_id
               )
group by s.customer_id;

临时表只会使此查询更复杂。

按表[SQL]中的日期汇总表值

2 个答案: