search
HomeDatabaseMysql Tutorial MySQL5.5 delete表连接语法改变

在MySQL5.5里,规范了sql语句表连接的写法。deleteusera,user2bfromuserajoinuser2bona.id=b.id;这样写在MySQL5.1里,可以正常执行,..

在MySQL5.5里,规范了sql语句表连接的写法。

  • 这样写在MySQL5.1里,香港服务器,可以正常执行,但在MySQL5.5里就报错,下面是一个测试:

    可以看到,执行时报错。那么规范后的写法是: 

  • 参考手册:

     

    本文出自 “贺春旸的技术专栏” 博客,网站空间,香港服务器,请务必保留此出处

  • Statement
    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
    How Do I Drop or Modify an Existing View in MySQL?How Do I Drop or Modify an Existing View in MySQL?May 16, 2025 am 12:11 AM

    TodropaviewinMySQL,use"DROPVIEWIFEXISTSview_name;"andtomodifyaview,use"CREATEORREPLACEVIEWview_nameASSELECT...".Whendroppingaview,considerdependenciesanduse"SHOWCREATEVIEWview_name;"tounderstanditsstructure.Whenmodifying

    MySQL Views: Which design patterns can I use with it?MySQL Views: Which design patterns can I use with it?May 16, 2025 am 12:10 AM

    MySQLViewscaneffectivelyutilizedesignpatternslikeAdapter,Decorator,Factory,andObserver.1)AdapterPatternadaptsdatafromdifferenttablesintoaunifiedview.2)DecoratorPatternenhancesdatawithcalculatedfields.3)FactoryPatterncreatesviewsthatproducedifferentda

    What Are the Advantages of Using Views in MySQL?What Are the Advantages of Using Views in MySQL?May 16, 2025 am 12:09 AM

    ViewsinMySQLarebeneficialforsimplifyingcomplexqueries,enhancingsecurity,ensuringdataconsistency,andoptimizingperformance.1)Theysimplifycomplexqueriesbyencapsulatingthemintoreusableviews.2)Viewsenhancesecuritybycontrollingdataaccess.3)Theyensuredataco

    How Can I Create a Simple View in MySQL?How Can I Create a Simple View in MySQL?May 16, 2025 am 12:08 AM

    TocreateasimpleviewinMySQL,usetheCREATEVIEWstatement.1)DefinetheviewwithCREATEVIEWview_nameAS.2)SpecifytheSELECTstatementtoretrievedesireddata.3)Usetheviewlikeatableforqueries.Viewssimplifydataaccessandenhancesecurity,butconsiderperformance,updatabil

    MySQL Create User Statement: Examples and Common ErrorsMySQL Create User Statement: Examples and Common ErrorsMay 16, 2025 am 12:04 AM

    TocreateusersinMySQL,usetheCREATEUSERstatement.1)Foralocaluser:CREATEUSER'localuser'@'localhost'IDENTIFIEDBY'securepassword';2)Foraremoteuser:CREATEUSER'remoteuser'@'%'IDENTIFIEDBY'strongpassword';3)Forauserwithaspecifichost:CREATEUSER'specificuser'@

    What Are the Limitations of Using Views in MySQL?What Are the Limitations of Using Views in MySQL?May 14, 2025 am 12:10 AM

    MySQLviewshavelimitations:1)Theydon'tsupportallSQLoperations,restrictingdatamanipulationthroughviewswithjoinsorsubqueries.2)Theycanimpactperformance,especiallywithcomplexqueriesorlargedatasets.3)Viewsdon'tstoredata,potentiallyleadingtooutdatedinforma

    Securing Your MySQL Database: Adding Users and Granting PrivilegesSecuring Your MySQL Database: Adding Users and Granting PrivilegesMay 14, 2025 am 12:09 AM

    ProperusermanagementinMySQLiscrucialforenhancingsecurityandensuringefficientdatabaseoperation.1)UseCREATEUSERtoaddusers,specifyingconnectionsourcewith@'localhost'or@'%'.2)GrantspecificprivilegeswithGRANT,usingleastprivilegeprincipletominimizerisks.3)

    What Factors Influence the Number of Triggers I Can Use in MySQL?What Factors Influence the Number of Triggers I Can Use in MySQL?May 14, 2025 am 12:08 AM

    MySQLdoesn'timposeahardlimitontriggers,butpracticalfactorsdeterminetheireffectiveuse:1)Serverconfigurationimpactstriggermanagement;2)Complextriggersincreasesystemload;3)Largertablesslowtriggerperformance;4)Highconcurrencycancausetriggercontention;5)M

    See all articles

    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

    Video Face Swap

    Video Face Swap

    Swap faces in any video effortlessly with our completely free AI face swap tool!

    Hot Tools

    Atom editor mac version download

    Atom editor mac version download

    The most popular open source editor

    Dreamweaver Mac version

    Dreamweaver Mac version

    Visual web development tools

    SublimeText3 Chinese version

    SublimeText3 Chinese version

    Chinese version, very easy to use

    Safe Exam Browser

    Safe Exam Browser

    Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

    SublimeText3 English version

    SublimeText3 English version

    Recommended: Win version, supports code prompts!