MYSQL网页设计PL/SQL Developer 6.02公布
这一切听起来不错，无疑DBaaS具有很多相对于RDBMS的优势。然而MySQL学习教程，DBaaS也有其局限性，云服务中固有的局限性就是之一。当客户开始将数据放入云端时，他们会遭遇到无法控制的网络性能问题。PL/SQLDeveloper-NewsSeptember14,2004-Version6.0.2releasedEnhancementsPartitionedtableswerenotdetectedcorrectlyonOracle8iPartitionstabpagewasvisiblewhenviewinganon-partitionedtableCodeAssistantdidnotdescribematerializedviewsCodeAssistantdidnotdescriberecordtypesdeclaredinanotherpackageCodeAssistantcouldremovespacestypedafteracommaFile->CloseAllcouldleadtoinvisibleconfirmationdialogFontBold&ItalicpreferencesdidnotworkforbrowserandgridKeyConfigurationpreferencewouldnothandleallkeysproperlyCompareUserObjectscouldincorrectlychangecolumnpropertieswhencolumnorderforsourceandtargettableisdifferentLargeDataEditorhadproblemswithXMLdatawithlines>65000charactersPreference"UseDBAviewsifavailable"couldcauseORA-00942afterswitchingfromaDBAusertoanormaluserCompilationerrorswerenotdisplayedwhen"createorreplace"andobjectnameareondifferentlinesCouldnolongerconnectwithjust/forexternallyidentifiedusersDeletingacolumnselectionintheeditorcouldalsodeleteadjacenthighlightedtextDroppingajavasourcefromtheObjectBrowserwouldcauseORA-29501PL/SQLBeautifierdidnotformatallANSIjointypescorrectlyOnOracle7ExplainPlanandTestfunctiondidnotreplacePL/SQLvariablesbybindvariablesTextImporterwouldonlyimport99recordswhenpastingfromclipboardDataGeneratordidnothandleamasterwith2detailscorrectUxThemerelatederrorsfixedBrowserFolderswouldnotsaveconnectionpropertyTSVExporterwouldskipfirstfieldifitwasemptyLargeDataEditornowcloseswhenpressingEscapeCompilingabodywithamissingorinvalidspecificationwith"Safecompilation"preferencewouldgivecompilationerrorswithtemporaryobjectnameHyperlinknavigationdidnotworkcorrectlyforcompoundcustomkeywordsHyperlinknavigationdidnotimmediatelyupdateCodeContentsGeneratingaTestScriptforanon-packagedprogramunitwithparameterswithuser-definedtypeswouldnotcreatelocalvariableswithcorrecttypesDroppinganobjectintheCompileInvalidObjectstoolwouldnotupdatethecompilationerrorlistFixedaproblemstartingspecificapplicationswhenPL/SQLDeveloperisrunningDataGeneratornumberprecisiondisplayedforfieldswithascaleof0wouldnotbecorrectExplainPlanandTestfunctionnowalsoreplacesconstantsbybindvariablesinselectstatementPressingacellbuttoninanemptySingleRecordgridinaSQLWindowwouldcauseanerrormessageExporttoExcelcoulddisplaycellsas####duetocolumnwidthSQLWindownowpreservesresultmessageafternavigatinginresultgridwhen"Showdictionaryinfo"preferenceissetTablesfolderinTablespacefolderinObjectBrowserdidnotlistpartitionedtablesCompareUserObjectsmemoryusageoptimizedCompareUserObjectslistincludedtablesfromtheOracle10grecyclebinFixedsplitterproblemandalignmentofeditorinXMLEditorOracleLogonpreference"FixedUsers"isnowstoredencryptedExcelinterfacewouldnothandleJapanesecharactersproperlyFixed"Invalidpointeroperation"errorsAugust25,2004-Version6.0.1releasedEnhancementsSupportforOracle10gEZCONNECTaddedPerformanceof"CopytoExcel"functionimprovedDDLforsynonymsnowuses"createorreplace"syntaxforOracle9.2andlaterPressingan"Autorefreshtimer"buttonnowimmediatelyexecutestheWindowShortcutsPlug-InenabledagainScrollbarinExplainPlanfunctionnowscrollsallcontentsCompareUserObjectswouldtrytorenamecolumnswhencolumnorderisdifferentCodeHierarchydidnothaveExplainPlanandTestpopupmenuitemsforselectstatementsExecutingaReportwouldcopytheSQLtotheclipboardReportwouldnotaskforpasswordwhen"lockedforothers"PL/SQLBeautifierpreviewdidnotshoweffectof"WrapzerolevelAND/OR"optionforControlStructuresProxysettingsaddedforUpdates&NewsRenaminganobjectintheSQLWindowcouldleadtoincorrect"Objecthasbeendeleted"messageBeautifierDMLRule"AND/ORunderwhereclause"wasalwaysenabledCodeContentscouldsometimesbeblankorout-of-dateFixedvariousaccessviolationsExplainPlanfunctiondidnotreplacerecordfieldPL/SQLvariablesinSQLtextbybindvariablesonOracle9.0andearlierSafecompilationcouldfailifthepackagebodycontainsreferencestoobjectswiththesamenameinanotherpackageDisablingthe"IncludeStorage"optionduringExportUserObjectswouldstillincludepartitionstorageinformationTextImporternowcorrectlyautodetectstextwithpipelinesLargeDataEditornowsupportsundo,redo,findandselectallTextImporterdatapreviewwouldnothighlightmultilinefieldscorrectly下载PLSQLDEV6.0.2.880
“MySQL实际上是一个数据库家族，你可以从选择一个并将其配置成可以满足你的大多数情况，”开源顾问公司Ethiqa的总裁如此表示，“因此，你可以在开始的时候选择一个小巧的版本产品，以后再根据需要来对其进行性能或大小上的扩展。” 至于淘汰的问题，只能说在你的项目周期之内，微软应该都不会倒闭。 对于数据库来说，查询是数据库的灵魂，那么SQL查询效率究竟效率如何呢？下文将带对SQL查询的相关问题进行讨论，供您参考。 个人感觉没有case直观。而且默认的第三字段（还可能更多）作为groupby字段很容易造成新手的错误。 varchar(max)\\\\nvarchar(max)类型的引入大大的提高了编程的效率，可以使用字符串函数对CLOB类型进行操作，这是一个亮点。 但是随着数据量的增大，这种成本差距会逐渐减小，趋于相等。（500万数量级只相差10%左右） 理解了存储结构，再阅读下性能优化的章节基本上会对sqlserver有个清晰地认识 无法深入到数据库系统层面去了解和探究 在select语句中可以使用groupby子句将行划分成较小的组，然后，使用聚组函数返回每一个组的汇总信息，另外，可以使用having子句限制返回的结果集。
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