1.获取当前日期的年份selectto_char(t.detect_date,'YYYY')selectextract(yearfromnow())为doubleprecision格式类型selectto_char((SELECTnow()::timestamp),'yyyy')2.获取...

GraphQL 是一种查询语言，用于替代RESTAPI。它允许客户端指定所需的数据，并且只获取这些数据，提升了数据获取的效率和灵活性。...

ReactiveProgramming 使得处理异步数据流和事件变得更加简洁。常用的库和框架包括： - RxJS:JavaScript的响应式扩展库。- Svelte:一个新的前端框架，支持声明式编程和更简洁的语法。...

在form_load方法中添加一下代码 双缓冲：Typetype=dataGridView_items.GetType();System.Reflection.PropertyInfopi=type.GetProperty("DoubleBuffered",System.Reflection.BindingF...

grep(globalregularexpressionprint)是Linux或其他类Unix操作系统中的一个功能强大的命令行搜索工具。它可以从文件或标准输入中搜索文本或字符串，并显示匹配的行或统计信息。grep命令有大量的选项和用法，本文将介绍一些常见的示例。grep命令可用于在一个或多个文件中搜索字符串或正则表达...

文档解释ORA-44739:Cannotdropthelastgroup.Cause:Anattemptwasmadetodropthelastgroupintheindex.Action:UsetheDROPINDEXstatementinstead.ORA-44739是Oracle数据库中的一个错误代码。它表明，用...

文档解释ORA-44742:Cannotaltercolumnsofatablethatissharedbyothergroup(s).Cause:Anattemptwasmadetoaddcolumnsto,modifycolumnsof,ordropcolumnsfromatablesharedbyothergro...

文档解释ORA-41604:cannotrevokeaprivilegethatwasnotgrantedCause:Anattemptwasmadetorevokeaprivilegethatwasnevergranted.Action:NoneORA-41604错误代表着不能撤销一个没有被授予的权限。官方解释常见案...

文档解释ORA-24167:incompatibleruleengineobjects,cannotdowngradeCause:thereareruleengineobjectsinthedatabasethatcannotbedowngraded.Action:checkutlincmp.sqlandremovea...

文档解释ORA-41697:attributeprefixmissinginaggregatespecification:stringCause:Anattemptwasmadetospecifyanaggregatepredicateacrossmultipleprimitiveeventtypeswithnoatt...

文档解释ORA-24909:callinprogress.CurrentoperationcancelledCause:TheOCIcallwasinvokedwhenanothercallontheconnectionwasinprogress.Action:CheckiftheOCIcallissupportedw...

文档解释ORA-28117:integrityconstraintviolated–parentrecordnotfoundCause:trytoupdate/insertachildrecordwithnewforeignkeyvalues,butthecorrespondingparentrowisno...

文档解释ORA-28385:cannotperformaPKIcertificate-basedmigrationCause:APKIcertificate-basedmigrationtoHSMwasattempted.Action:PerformasymmetricMasterKeymigration.ORA-28...

文档解释ORA-15083:failedtocommunicatewithASMBbackgroundprocessCause:AdatabaseinstancefailedtocommunicatewithitsASMBbackgroundprocesswhenattemptingtoaccessanASMfile....

文档解释ORA-15133:instancerecoveryrequiredfordiskgroupstringCause:Aninstanceintheclustercrashedmakinginstancerecoverynecessary.Action:None.Thiserrorshouldnotnormall...