


For example, I have a database with an order table in it. The table name is orders. This order table has a field add_time, which is the timestamp of adding the order.
I now want to generate a report that displays the daily order quantity and growth, and also needs to include the number of days (Y-m-d format is sufficient, because I will eventually output it to the front-end echarts statistical chart or highcharts statistical chart), how to write the SQL statement for this requirement?
Happy Dragon Boat Festival, thank you for your answer! ~
Reply content:
For example, I have a database with an order table in it. The table name is orders. This order table has a field add_time, which is the timestamp of adding the order.
I now want to generate a report that displays the daily order quantity and growth, and also needs to include the number of days (Y-m-d format is sufficient, because I will eventually output it to the front-end echarts statistical chart or highcharts statistical chart), how to write the SQL statement for this requirement?
Happy Dragon Boat Festival, thank you for your answer! ~
Because we have just completed the framework of an operating system, I would like to provide a basic idea:
Create a new table and put every item of data you need to count, as well as the statistical time, as columns of the new table, like this:
create table analysis ( today_timestamp varchar(20), order_count varchar(20), increase_value varchar(20), primary key (today_timestamp) );
Write a php script, for example, call
job.php
to get the data you need to count that day: number of orders, growth, etc. For example, if you need the quantity of all orders, justselect count(*) from orders
. How to write it specifically is another question. After obtaining it, insert it into the tableanalysis
just now. If you want it to execute automatically, consider using crontab.When you
要输出到前端的echarts统计图或者highcharts统计图
, just read the data in this table by date
Use group by statistics. The date field is divided into year, month, day, hour, and minute. Each is a column for statistics. Remember to add indexes and sub-tables.
It is best to provide a sample data structure for your requirement
<code>SELECT FROM_UNIXTIME(add_time, "%Y-%m-%d") order_date, count(1) AS today_c, count(1) - last_c AS change_with_last FROM orders LEFT JOIN ( SELECT FROM_UNIXTIME(add_time, "%Y-%m-%d") AS last_date, count(1) AS last_c FROM orders GROUP BY FROM_UNIXTIME(add_time, "%Y-%m-%d") ) last ON ( FROM_UNIXTIME(temp.add_time, "%Y-%m-%d") = DATE_ADD( last.last_date, INTERVAL 1 DAY ) ) GROUP BY FROM_UNIXTIME(add_time);</code>
This should be able to achieve the expected results, but it is best to use a data table to count the daily results, otherwise there will be performance problems

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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