若数据表(info)有如下字段:
id subject message dateline replies views istop
主题 信息 时间 回复 点击数 是否推荐
如何赛选出15天(半个月)内最值得查看/推荐的信息?
一般写法是:
SELECT id,subject,message,dateline,replies,views,istop FROM `info` WHERE istop = 1 ORDER BY replies DESC,views DESC,dateline DESC LIMIT 10;
以上赛选出来的信息,会有一个严重的BUG错误,也就是
replies 和 views 越大 越会排在前面,越往前排,replies 和 views 将会越大,所以这是一个正比,同时这样的操作将对其他信息产生不公正的影响。
现在,求一个ORDER BY 公式不因为replies 和 views 越大而越靠前的算法,
目前我能想到的是:LOG对数函数,对数不会因为replies和views越大而越大。
回复内容:
若数据表(info)有如下字段:
id subject message dateline replies views istop
主题 信息 时间 回复 点击数 是否推荐
如何赛选出15天(半个月)内最值得查看/推荐的信息?
一般写法是:
SELECT id,subject,message,dateline,replies,views,istop FROM `info` WHERE istop = 1 ORDER BY replies DESC,views DESC,dateline DESC LIMIT 10;
以上赛选出来的信息,会有一个严重的BUG错误,也就是
replies 和 views 越大 越会排在前面,越往前排,replies 和 views 将会越大,所以这是一个正比,同时这样的操作将对其他信息产生不公正的影响。
现在,求一个ORDER BY 公式不因为replies 和 views 越大而越靠前的算法,
目前我能想到的是:LOG对数函数,对数不会因为replies和views越大而越大。
如何赛选出15天(半个月)内最值得查看/推荐的信息?其实这个有比较多做法。比如通过一个时间字段也可以做到和这个比较相似。不过我想推荐是我的一个做法就是建一个字段。加上自己一个算法得出一个数直然后order by 字段 desc limit 15。这样子。我认为是比较高效的。

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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