mysql连续聚合

连续聚合是按时间顺序对有序数据进行聚合的操作。

在下面的救示例中将使用EmpOrders表，该表用于存放每位员工每月发生的订购数量。

运行如下 代码创建EmpOrders表并填充示例数据。

CREATE TABLE EmpOrders (
empid INT NOT NULL,
ordermonth DATE NOT NULL,
qty INT NOT NULL,test
PRIMARY KEY (empid,ordermonth)
);

查询order表和orderdetails表住EmpOrder表插入每个月的订单，sql语句如下（技巧是根据月分组）

INSERT INTO EmpOrders
SELECT a.employeeid,orderdate AS Order date,SUM(quantity) AS qty
FROM orders a
INNER JOIN orderdetails b
ON a.orderid=b.orderid
GROUP BY employid,DATE_FORMAT(orderdate,'%Y-m');

下面给出生成示例数据的php文件

<?php
$sql = "INSERT INTO emporders SELECT %s,'%s-%02d-01',%s;".'<br />';
$insert_sql = '';
for($empid=1;$empid<=8;$empid++)
{
    for($year=2009;$year<=2015;$year++)
    {
        for($month=1;$month<=12;$month++)
        {
            $num = rand(20,800);
            $insert_sql .= sprintf($sql,$empid,$year,$month,$num);
        }
        $insert_sql .= '<br />';
    }
}
echo $insert_sql;

以下是员工订单表EmpOrder部分数据

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" alt="" />

下面根据EmpOrders表讨论3个连续聚合的问题：累积、滑动、年初至今。