刚刚才知道MySQL的varchar类型比较默认是忽略大小写的,还忽略最后的空格。C.5.5.1. Case Sensitivity in String Searches mysql SELECT 'a' = 'A'; - 1 解决方案是使用BINARY操作符10.1.7.7. The BINARY Operator mysql SELECT BINARY 'a' = 'A'; - 0mysql
刚刚才知道MySQL的varchar类型比较默认是忽略大小写的,还忽略最后的空格。C.5.5.1. Case Sensitivity in String Searches
<code>mysql> SELECT 'a' = 'A'; -> 1 </code>
解决方案是使用BINARY操作符10.1.7.7. The BINARY Operator
<code>mysql> SELECT BINARY 'a' = 'A'; -> 0 mysql> SELECT 'a' = 'a '; -> 1 mysql> SELECT BINARY 'a' = 'a '; -> 0 </code>
原文地址:MySQL字符串比较大小写问题, 感谢原作者分享。

todropaviewInmySQL,使用“ dropviewifexistsview_name;” andTomodifyAview,使用“ createOrreplaceViewViewViewview_nameAsSelect ...”。 whendroppingaview,asew dectivectenciesanduse和showcreateateviewViewview_name;“ tounderStanditSsstructure.whenModifying

mySqlViewScaneFectectialized unizedesignpatternslikeadapter,Decorator,Factory,andObserver.1)adapterPatternadaptSdataForomDifferentTablesIntoAunifiendView.2)decoratorPatternenhancateDataWithCalcalcualdCalcalculenfields.3)fieldfields.3)

查看InMysqlareBeneForsImplifyingComplexqueries,增強安全性,確保dataConsistency,andOptimizingPerformance.1)他們simimplifycomplexqueriesbleiesbyEncapsbyEnculatingThemintoreusableviews.2)viewsEnenenhancesecuritybyControllityByControllingDataAcces.3)

toCreateAsimpleViewInmySQL,USEthecReateaTeviewStatement.1)defitEtheetEtheTeViewWithCreatEaTeviewView_nameas.2)指定usethectstatementTorivedesireddata.3)usethectStatementTorivedesireddata.3)usetheviewlikeatlikeatlikeatlikeatlikeatlikeatable.views.viewssimplplifefifydataaccessandenenanceberity but consisterfort,butconserfort,consoncontorfinft

1)foralocaluser:createUser'localuser'@'@'localhost'Indidendify'securepassword'; 2)foraremoteuser:creationuser's creationuser'Remoteer'Remoteer'Remoteer'Remoteer'Remoteer'Remoteer'Remoteer'Remoteer'Rocaluser'@'localhost'Indidendify'seceledify'Securepassword'; 2)

mysqlviewshavelimitations:1)他們不使用Supportallsqloperations,限制DatamanipulationThroughViewSwithJoinsOrsubqueries.2)他們canimpactperformance,尤其是withcomplexcomplexclexeriesorlargedatasets.3)

porthusermanagementinmysqliscialforenhancingsEcurityAndsingsmenting效率databaseoperation.1)usecReateusertoAddusers,指定connectionsourcewith@'localhost'or@'%'。

mysqldoes notimposeahardlimitontriggers,butacticalfactorsdeterminetheireffactective:1)serverConfiguration impactactStriggerGermanagement; 2)複雜的TriggerSincreaseSySystemsystem load; 3)largertablesslowtriggerperfermance; 4)highConconcConcrencerCancancancancanceTigrignecentign; 5); 5)


熱AI工具

Undresser.AI Undress
人工智慧驅動的應用程序,用於創建逼真的裸體照片

AI Clothes Remover
用於從照片中去除衣服的線上人工智慧工具。

Undress AI Tool
免費脫衣圖片

Clothoff.io
AI脫衣器

Video Face Swap
使用我們完全免費的人工智慧換臉工具,輕鬆在任何影片中換臉!

熱門文章

熱工具

EditPlus 中文破解版
體積小,語法高亮,不支援程式碼提示功能

SublimeText3 Mac版
神級程式碼編輯軟體(SublimeText3)

SublimeText3 英文版
推薦:為Win版本,支援程式碼提示!

禪工作室 13.0.1
強大的PHP整合開發環境

SublimeText3漢化版
中文版,非常好用