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TheBrowserParsEshtMlintothedOmtreeIncrementAllyStesareceed.2.externalResourceslikecssandjavaScriptAreloadedAsynchronously, witcsscsscsscsscscscscscscscscriptularjavaScriptbeingparser-blocking.3.CSSSISPARSEDOTECSSOM, ATREEOFSTYLENTOCSSOM
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CSS ?? ???? HTML ??? ?? ? ?? ?? ???? ??? ?? ? ???? ?????. 1. ?? ???? ?? [??] ??? ???? ?? ??? ?? ??? ??????. 2. ?? ?? ???? ????? ?? ?? [attribute = "value"]? ???? ??? ?????. 3. ??? ??? ??? ????? ?? ? (? : ?? [name = "email"i]) ??? i ???? ??????. 4. [??*= "value"]? ???? ?? ?? ??? ???? ?? ? ?? [attrib
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aclassisablueprint, whileanobjectisaninstanccecreatedfritclass; 1.AclassDefinesPropertiesandMethodSusingTheClassKeywordandServesAsAtemPlate; 2.AnObjectIscreatedUsingThenewkeywordandsactualData;
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thesUblimeTexTsettingSfileIslocatedintheussubfolderfthepackagesDirectory, anditsPathVariesByos : 1.windows :%appdata%\ sublimet ext \ packages \ user \ preferences.sublime-settingsorc : \ user [yourusername] \ appdata \ roaming \ sublimetext \ packages \ user \; 2.macos : ~/l
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MySQL ????? ???? ??????? ???? ?? ???? ?? ?? ??? ? ??? ??? ?? ??? ???? ??? ???????. 1. ?? ? ???? : ??? ?? (? : id = 1)?? ?? ???? ??????. 2. ?? ? ???? : ?? ??? ?? ?? ?? ?????. 3. ?? ? ???? : ?? ???? ???? ?? (? : ??? include.com); 4. ??? ???? ???? ? ? ?? ????? (?? ??, ???? ????? ??). 5. ?? ?? : ?? ?? ???, ??? ??? ??? ?? ? ??? ????? ?????. ???? ???? ??? ??, ??? ? ?? ? ???? ?? ??? ?????. ???, ????? ???? ?? ? ? ??? ???? ?????? ???????.
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??? ?? ???? ??? ??? HTML, CSS ? ??? JavaScript? ???? ??? ???? ????? ? ?? ? ?? ??? ???? ????. 1. ???? ???? ?? ? ?? ?? ??? ??????. 2. ??? ????? ??? ???? CSS? ?? 3 ?? ???? ?????. 3. CSS ??? ???? ?? ???? 45?? ?? ? ? ?? ??? ?? ???? 45? ?????, ??? ?? ?? ???? 45? ???? ?? ?? "x"??? ???? ?? ???? ??? ????. 4. JavaScript? ???? ?? ???? ???? ?????? ??????. 5. ??? ??? ????? ?? @Media (?? ?? ?? : ??)? ?????. ??? ???? ?? ?? ?????
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theElementCapturesUserInputwithTypesliketext, ???, ??, ?? FreeTextEntry.2.theelementProvideAsetofSuggestEdValuesforan, DisplayEdAsadropDownWhenthEusErsTyping.3.3.3.
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HTML? ? ?? ?? ?? ??? ?????. 1. ?? ?? ()? ???? ??? ??? ???? ?? ??? ??? ?? ???? ????? ???? ??? ?????. 2. Unordered List ()? ??? ???? ???? ?? ? ???? ???? ????? ???? ?? DOT ??? ?????. 3. ?? ?? ()? ?? ?? FAQ? ??? ?? ?? ? ?? ??? ??? ?? ? ??? ?????. ? ?? ??? ??? ??? ???? ?? ?? ?? ? ? ????.
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the elementisusedTorePresentDates ? Amachine-ReadableFormatwhuman-ReadableText, SEO, ? DatainterOperability.1.Itenablesmacine-ReadabledatesThedateTimeattriver, AidingsearchEngines, CalendarIntegration, CalendarIntegration,
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?? ??? ??? ?? ???? ??????? ?? ??? ???? ???????. 1. Information_schema.columns? ???? MySQL, PostgreSQL, SQLServer ?? ??? ??? ??? ?? ? ?????? ??? ??????. 2. PostgreSQL? PG_CATALOG ??? ???? ?????? ??? ??? ?? ? ????. 3. SQLServer? sys.columns and sys.tables query? ?? ? ? ?? ??? ?? ? ????. 4. MySQL? information_schema.columns? arribute_maximum_length ? ?? ??? ?? ? ? ????.
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?? ???? quallareusedtoenforcedataintegrity, ensureaccuracy ? maintainconsistencybyprecreventinginvaliddataentry.1. nontnullensuresacolumncannothavenullvalues; 2.unique -guaranteesAllcolumnValuesaredistinct;
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??? HTML? ???? ????? ??? ???? ???, SEO ? ?? ???? ???? ? ??? ??? ???? ????????. 1. ?? ????? ??? ???? ???? ??? ????? ???? ??????. 2. ???? ? ??? ??? ???? ?? ?? ??? ???? ?????. 3. ?? ????? ??? Aria-Label? ????? ??? ???? ??? ???? ??????. 4. ?? ?? ??? ??? ???? ???? ?? ?? ??? ?????. 5. ??? ??? ?? ??? ????? ?? SkipLink? ??????. ? ??? ???? ???? ???? ??? ???? ?? ????? ?? ?????.
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??? ?? ??? @interface? ?? ???? ???? ?? ??? ?? ? ? ????. 2. @Target? ???? ?? ?? ???? ?? ?? ???? ??? ?????. 3. @retention (???)? ???? ???? ??? ?? ??? ????. 4. ?? ??? ?? ???? ??? ?? ??????. 5. ??? ??? ????? ?? ?????? ???? ? ??? ? ??? ??? ??? ?? ?????.
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auto-incrementingprimarykeysinmysqlaremanagedeffectiveficipicallyfollowingkeypractices : 1. undatauto_incrementensuresunique, monotonically-increasingids, withgapsbeingnormalduetorollbacks, deletions, orfailedinserts.2
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MySQL? ?? 8.0.16?? ???? ??? ???? ?????? ?? ?? ??? ?????. 1. ?? ??? ? ?? ??? ?????? : CreateTable? ???? ≥18, ??> 0, ?? ?? ?? ?? ?? ??? ??????. 2. ?? ??? ???? ?? ???? ??????. AltertableAddConstraint? ???? ?? ?? ?? ??? ?? ?? ?? ??????. 3. ??? ?? ?? : ?? ?? ≥ ???? ?? ? ?? ??? ?? ?? ? ?? ? ??? ??????. ?? ???? ?? ??? ??????. 4. ?? ?? ?? : altertabledropconstraint? ???? ??? ??? ?????. 5. ?? : MySQL8.0.16, Innodb ?? Myisam? ???????.
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themedodattributeinanhtmlformdatermineshowformdataissentTotheserUsingeTergetOrpost.1.usemethod = "get"toAppendDatoTheUrlasaQueryString, ??? fornon- ???, idempOtentRequestSlikeSearches, butlimitedByUrllength.2.usemethod = "
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formysql, createeafull-textindexusing $ table-> fullText ([ 'title', 'content']) inmigrationandandUsewhereWhereFullText ([ 'title', 'content'], $ SearchTerm) inlaravel8 forfull-textearchwithBooleanModesUpport; 2.forpostgresql, createAnginviAdb
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Theroleofadatabaseadministrator (DBA) inasqlenvenvironmentistoensuredatabasesaresecure, ?? ??, ??? ? ?? ??
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HTML5? ???? ??? ?? ??? ????? ??? ?? ?? ??? ??? ??? ?? ?? ??? ?? ? HTML ??? ???????. 2. CSS? ?? ?? ???? ??? ????? ??? ????????. 3. JavaScript? ???? ?? ?? ??, ?? ??, ?? ?? ? ??? ??? ??????. 4. ????? ?? ??, ?? ??, ??? ??? ? ?? ?????? ?? ??? ??? ?????. ????? HTML, CSS ? JavaScript? ??? ?? ???? ??? ??? ??? ???? ??? ????? ???? ???? ??? ???? ?? ??? ???? ???, ??? ? ??? ?? ??????? ???????. ? ??? ?????? ???? ?? ???? ??? ? ????.
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