


I am currently building a simple Q&A website
Now it has the following four elements
People, topics, questions, answers
How to design a database (MySQL)
People can follow people, topics, questions
Questions can have multiple hashtags
feed Streams (displayed on the home page) can appear mixed:
New questions added to the topics I follow
New answers to questions I’m concerned about
Questions from people I follow
I feel that the database is not easy to design. How should the data on the home page mix and display different information?
Reply content:
I am currently building a simple Q&A website
Now it has the following four elements
People, topics, questions, answers
How to design a database (MySQL)
People can follow people, topics, questions
Questions can have multiple hashtags
feed Streams (displayed on the home page) can appear mixed:
New questions added to the topics I follow
New answers to questions I’m concerned about
Questions from people I follow
I feel that the database is not easy to design. How should the data on the home page mix and display different information?
You can design a special feed flow table. This table can support home page display and can also be used as an information collection table.

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”。

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)”。

随着互联网的普及和应用场景的不断增加,数据库设计成为了极其重要的一个问题。而在数据库设计中,冗余字段是一个很重要的问题。冗余字段是指在设计数据库时,出现了重复或不必要的字段。虽然冗余字段可以在一定程度上提高查询效率和速度,但同时也会浪费存储空间和加大维护难度,甚至会影响数据的一致性和安全性。因此,在PHP编程中,应该遵循一定的最佳实践,来解决冗余字段带来的问

去除方法:1、使用substr_replace()函数将首位数字替换为空字符串即可,语法“substr_replace($num,"",0,1)”;2、用substr截取从第二位数字开始的全部字符即可,语法“substr($num,1)”。

利用MongoDB技术开发中遇到的数据库设计问题的解决方案探究摘要:随着大数据和云计算的快速发展,数据库设计在软件开发中显得尤为重要。本文将讨论开发过程中常遇到的数据库设计问题,并通过具体代码示例来介绍MongoDB的解决方案。引言:在软件开发过程中,数据库设计是一个关键的环节。传统的关系型数据库在处理大规模数据时存在一些性能和可扩展性的问题。而MongoD

去掉方法:1、用substr_replace()删除右边n位置开始的全部字符,语法“substr_replace($str,"",-n)”,参数“n”为需要去除的字符个数;2、用substr(),语法“substr($str,0,-n)”。

php有操作时间的方法。php中提供了丰富的日期时间处理方法:1、date(),格式化本地日期和时间;2、mktime(),返回日期的时间戳;3、idate(),格式化本地时间为整数;4、strtotime(),将时间字符串转为时间戳等等。


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