Home Backend Development PHP Tutorial php操作MYSQL 语句条件是越多越好还是越少越好呢,该如何处理

php操作MYSQL 语句条件是越多越好还是越少越好呢,该如何处理

Jun 13, 2016 am 09:59 AM
delete quot table update where

php操作MYSQL 语句条件是越多越好还是越少越好呢
问一下
假如现在想update一下
sql1="update table set aa=aa where id=1";
sql2="update table set aa=aa where id=1 and classid=12 and infoid=1";

delete:
sql1="delete from table where id=1";
sql2="delete from table where id=1 and classid=12 and infoid=1";


请问一下update时 sql1和sql2哪个更好些
  delete时 sql1和sql2哪个更好些

请说一下原因,谢谢。

------解决方案--------------------
那你就不需要提这个问题了嘛...明显是老鸨(Mysql)给你筛选一下就可以了。要不那些判断条件是做啥用的,我倒...相对来说条件越精确执行的效率越高,结果就精确,当然前提是你的索引,以及SQL语句的写法要正确。很多时候条件没写好反而起反作用。

2,和老鸨子讲一下,身高要170的,上围要80的,把符合这些条件的小姐喊来,然后再从符合这些条件的里面找个叫 如花 的

这个时候老鸨子果断给你找了个如花,在你一番XXOO之后 你发现.... 他奶奶的居然是个变性人! 所以 你的条件一定要弄对。哈哈哈


探讨

引用:
条件越多 数据库就要做更多的功,就如你需要的招式越多小姐就得做更多的服务一个道理。所以如果你仅仅是需要高潮,可能撸一下就有了,那些什么毒龙,冰火二重天就可以省了...显而易见的,是吧.前提还是 你究竟需要什么服务.


我的想法是这样的:
既然对小姐感兴趣,还是拿小姐说吧:
假如我现在找小姐,现在有1000个供我选择(太爽了),要是我要找个……
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
1 months ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Fix: Google Chrome update check failed with error code 3: 0x80040154 Fix: Google Chrome update check failed with error code 3: 0x80040154 Apr 13, 2023 pm 05:46 PM

Google Chrome is one of the most popular browsers in the world and many users prefer to use it as the default browser on their Windows PCs. Chrome offers a wide range of features that make the browsing experience enjoyable and effortless, and therefore, it remains one of the most trusted browsers. But just like any other browser, even Chrome has its own shortcomings, and it's equally prone to bugs and glitches when you need it most. One such error is Error Code 3: 0x80040154, which occurs while checking for Google Chrome updates. The error message reads "An error occurred while checking for updates. The update check failed to start (Error code 3: 0x80080005) or (Error

What is the delete key on the keyboard? What is the delete key on the keyboard? Mar 16, 2023 pm 04:48 PM

There are two keyboard delete keys: del (delete) key and backspace key. Backspace is also called the backspace key. This key can delete the text content in front of the cursor; and the delete key can delete characters, files and selected objects. Each time you press the del key, a character to the right of the cursor will be deleted, and the character to the right of the cursor will move one frame to the left; when one or more files/folders are selected, press the Del key to quickly delete; in some applications Select an object in the program and press the Del key to quickly delete the selected object.

What is the function of delete key What is the function of delete key Mar 10, 2023 pm 06:07 PM

The functions of the delete key are: 1. Delete characters; each time the delete key is pressed, a character to the right of the cursor will be deleted, and the character to the right of the cursor will move one frame to the left. 2. Delete files; when one or more files/folders are selected, press the Delete key to quickly delete them (move to the Recycle Bin for recovery). 3. Delete the selected object; select an object in some applications and press the Delete key to quickly delete the selected object.

How to enable/disable VS Code automatic updates How to enable/disable VS Code automatic updates Apr 28, 2023 am 09:28 AM

If you are using Visual Studio Code (VSCode) and thinking about how to disable its automatic software updates and how to disable the automatic updates of its extensions, then read this article. If you don't use VSCode often, open the editor after a long period of time and want to enable automatic updates, this article will also guide you in doing so. Let us discuss in detail the different ways to enable or disable VSCode automatic updates. Table of Contents Method One: Use Settings to Enable/Disable VSCode Automatic Updates Step 1: Open VS Code and click the gear-shaped symbol in the lower left corner. Step 2: Click Settings in the list that appears. Step 3: Type update in the search bar and hit enter. Find Updates: Pattern 4

KDE Plasma 6.1 brings many enhancements to the popular Linux desktop KDE Plasma 6.1 brings many enhancements to the popular Linux desktop Jun 23, 2024 am 07:54 AM

After several pre-releases, the KDE Plasma development team unveiled version 6.0 of its desktop environment for Linux and BSD systems on 28 February, using the Qt6 framework for the first time. KDE Plasma 6.1 now comes with a number of new features t

Solution to high CPU usage of Microsoft compatibility telemetry Solution to high CPU usage of Microsoft compatibility telemetry Mar 16, 2024 pm 10:16 PM

When we use the win10 system, we sometimes encounter situations where the computer becomes stuck. Then when we check the background process, we find that a Microsoftcompatibilitytelemetry process takes up a particularly high amount of resources. So what is going on? Users can try to uninstall the third-party protection software and then try a clean boot to operate. Let this site carefully introduce to users the solution to the high CPU usage of Microsoftcompatibilitytelemetry. Solution to the high CPU usage of Microsoftcompatibilitytelemetry Method 1: Try after uninstalling the third-party protection software

How to Control + Alt + Delete: Mac Tutorial How to Control + Alt + Delete: Mac Tutorial Apr 16, 2023 pm 12:37 PM

Control+Alt+Delete: "Mac" mode Ctrlaltdel is a common key combination used by Windows users to open Task Manager. They usually exit unwanted applications from the manager menu to free up some space on their computer. The Control+Alt+Delete Mac variant lets you open the Force Quit menu. If Mac users want to quit the program causing the problem or view open programs, they can interact with the menu to investigate further. How to perform ControlAltDelete on Mac? If you have any malfunctioning applications, you must use this key combination to

How to use UPDATE statement in SQL How to use UPDATE statement in SQL Jun 02, 2023 pm 09:13 PM

SQLUPDATE statement The Update statement is used to modify the data in the table. The syntax is as follows: UPDATE table name SET column name = new value WHERE column name = certain value "Person" table: LastNameFirstNameAddressCityGatesBillXuanwumen10BeijingWilsonChamps-Elysees Update a column in a certain row UPDATEPerson SETFirstName="Fred" WHERELastName="Wilson" Result: LastNa

See all articles