具有两个不同日期范围的请求答案

【问题标题】：Request with two different dates ranges具有两个不同日期范围的请求
【发布时间】：2017-08-30 15:32:22
【问题描述】：

我对 MySQL 提出了两个不同日期范围的请求有一点问题。

我需要有 nb_sales 和 last_sales 直到 2014 年，但 frequence 仅适用于过去一年。

我想要的结果：

customer_id     |    nb_sales    |   last_sales  |   frequence
---------------------------------------------------------------
Customer ID     | Sales make by  |  How many days|  How many sales
                |  the customer  |  since the    |  has been made
                |                |  last sales?  |  this year?

第 1-3 列在第一个日期范围内：今天到 2014 年
第 4 列在第二个日期范围内：今天到 y-1

所以我尝试了：

创建一个临时表并插入频率
SELECT customer_id、nb_sales、last_sales 和 frequence 与LEFT OUTER JOIN

第一步没问题，但第二步我没有任何结果或错误消息......当我想LEFT OUTER JOIN我的临时表时发生这种情况：

LEFT OUTER JOIN tmp_frequence 
  ON tmp_frequence.client_id = sales_flat_order.customer_id

也许你有更好的主意？

CREATE TEMPORARY TABLE tmp_frequence (
    id INT UNSIGNED NOT NULL AUTO_INCREMENT,
    client_id INT,
    frequence INT,
    PRIMARY KEY (id)
);

INSERT INTO tmp_frequence (client_id, frequence)
SELECT sales_flat_order.customer_id, COUNT(sales_flat_order.entity_id)
FROM sales_flat_order
WHERE sales_flat_order.created_at BETWEEN '2014-05-22 00:00:00' and '2017-07-31 23:59:59'
GROUP BY sales_flat_order.customer_id;

/* ------------------------------  */ 
SELECT  
-- * , 
sales_flat_order.customer_id customer_id,
COUNT(sales_flat_order.entity_id) nb_sales,
DATEDIFF("2017-07-31",DATE_FORMAT(MAX(sales_flat_order_item.created_at),"%Y-%m-%d")) last_sales,
tmp_frequence.frequence frequence

FROM adl_ec.sales_flat_order_item 
LEFT OUTER JOIN sales_flat_order 
  ON sales_flat_order.entity_id = sales_flat_order_item.order_id 
LEFT OUTER JOIN tmp_frequence 
  ON tmp_frequence.client_id=sales_flat_order.customer_id

WHERE sales_flat_order_item.created_at BETWEEN '2014-05-22 00:00:00' and '2017-07-31 23:59:59'
GROUP BY customer_id;

DROP TABLE tmp_frequence ;

【问题讨论】：

我不知道您所说的“暂时性”是什么意思，但是您的 WHERE 子句正在将您的 LEFT JOIN 转换为 INNER JOIN。外部表的条件需要包含在外部联接的ON 子句中，因为在返回外部联接的NULL 结果之后执行WHERE 子句。除此之外，我真的不知道你想做什么来提供任何帮助......
需要查看数据样本（和预期结果）
“不工作”是什么意思？什么是“工作”？这段代码应该做什么？请阅读minimal reproducible example 并采取行动。您需要向我们解释一切的图像，因为我们不知道您在说什么——因为我们不知道。同样“提出具有两个时间性的请求”也没有意义。另请阅读教科书内连接和左连接的定义。
感谢您的帮助，并为我的英语感到抱歉...我已根据您告诉我的信息编辑了帖子。也许现在更清楚了？
您的WHERE 中有一个Space sales_flat_order_item .created_at 对您的实际查询也是如此吗？

标签： mysql sql select inner-join

【解决方案1】：

我终于找到了解决办法。
真的很感谢你的帮助:)

DROP TABLE IF EXISTS tmp_frequence;
CREATE TEMPORARY TABLE tmp_frequence (
    id INT UNSIGNED NOT NULL AUTO_INCREMENT,
    client_id INT,   
    recence INT,
    frequence INT,
    montant INT,
    PRIMARY KEY (id)
);

INSERT INTO tmp_frequence (client_id, frequence)
SELECT sales_flat_order.customer_id, COUNT(sales_flat_order.entity_id)
FROM sales_flat_order
WHERE sales_flat_order.created_at BETWEEN '2016-07-31 00:00:00' and '2017-07-31 23:59:59'
GROUP BY sales_flat_order.customer_id;


INSERT INTO tmp_frequence (client_id, recence, montant)
SELECT
sales_flat_order.customer_id,
DATEDIFF("2017-07-31",DATE_FORMAT(MAX(sales_flat_order_item.created_at),"%Y-%m-%d")) recence,
COUNT(sales_flat_order.grand_total) montant

FROM adl_ec.sales_flat_order_item 
LEFT OUTER JOIN sales_flat_order ON sales_flat_order.entity_id = sales_flat_order_item.order_id 
AND sales_flat_order_item.created_at BETWEEN '2014-05-22 00:00:00' and '2017-07-31 23:59:59'
AND qty_invoiced >0
AND sales_flat_order_item.sku NOT LIKE '%abo%'
AND sales_flat_order.total_qty_ordered < 5

GROUP BY customer_id;

SELECT tmp_frequence.client_id,MAX(tmp_frequence.recence) Recence,MAX(tmp_frequence.frequence) Frequence,MAX(tmp_frequence.montant) Montant
FROM tmp_frequence 
GROUP BY tmp_frequence.client_id;

【讨论】：