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Oracle Data Guard?? ?? ??? ???? ??

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SQL? ???????? ?? ???? ?? ??? ??????

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Redis ? ???? ?? ??????? ??? ?????

redisisanin-memorydatastorsorusedasadatabase, ??, ? ??? ???, ??? speedandversatility.itstoresdatainmemoryforfastperformance, supportSvariousDatrastructure, andussimpleCommandInterface, butlackstheThedUrabilityAndqueryCapabilitifilities oftra

SQL? ?? ???? ??????

TrimaryTablesInsqlaresession- ?? ?, ???? ???? whoennolondereded ? internicediatestoragetosimplifycomplexqueries.1. theyimprovePerformanceBreakingDownClexQueriesIntosteps.2.theWeyStoreMediaterSultsOrreuse.3.theysimplifyqu

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?????? ??? ?? ?? ??? ???? ???? ??? ?????. 1. ?? ??? ?? ?? ??; 2. ?? ???? ??; 3. ?? ???? ???? ??. PostgreSQL, MySQL ? SqlServer? ?? SQLServer? ???? ?? ???? ?? ?? ?? ??? ??? ? ????. ?? ???? ?? ??? ??? ?? ??? ???? ?? ???? ?? ?? ??? ??? ? ? ????. ?? ?? PostgreSQL? setlocaldEfault_transaction_Read_only = on? ???? MySQL? setsessionslead_on? ?????.

MySQL?? ??? ???? ??

USETHECHECKTABLECMANDTODIPERCKECKERCERERSERS : CheckTableTable_name; Aresultof "OK"inthemsg_textColumnIndicatesNoissues, whilevalues whilevalues? ?? "???"SignalProblems.2.understanderstandestAnderstandStandStandStandStandStandStandStanderstAnderstAnderstAnderstAnderstAnderstAnderstAnderstAnderstandStandStandStandStandStandStandStandStandStandStandStandStandStandStandStandStandStandStandStandStandStandestAttaUrruption

MySQL?? SavePoint?? ????? ???? ??

SavePointInmySqlallowsPartialRollbackWithInatrAnsaction, PreservingEarlierWork; 2.StartWithStartTransactionOrbegin; 3.SetAVePointUsingSavePointSavePoint_Name; 4.RollBackToitWithRollToSavePointifanerRoreccurs; 5.ContineTERANSACTORCOMMITFTERROL

?? ?? ? SEO ??????? ?? MySQL ???

?? ?? ? SEO ?? ? MySQL? ?????? ?? ???? ? ?? IndoDB ?? ??? ???? ????. ???? ????? ??? ????. ? ??? ? ?? ??? ? ?????? ???? ?? ??? ???? ? ???, ??? ?? ? ???? ????? ? ??? ? ???? ???? ????. ?? InnoDB? ?? ???? ? ?? ??? ??? ???? ??? ?? ??? ?????. ??? ???? ???? ?? ? ??? ?? ???? ?? ??? ?? ???? ???????. ?? ???? innodb_buffer_pool_size, innodb_io_capacity ?? ?? ?? ??? ????? ? ??? ???. ??? ? ??? ??? ???? ?? ?? ???? ???? ?? ???? ????? ??? ??? ??? ??? ? ? ????.

MySQL?? ? ???? ???? ??

MySQL? ???? WHERE ??? ?? ??? ???? ?? ??? ???? ?? ???? ? ?????. 1. ?? ??? selectColumn1, collect2fromtable_namewherecondition1andcondition2???. 2. ??? ????? ?? ??? ???????. 3.?? ??? ???? ???? ?? ?? ? ?? ? ? ????. 4. ?????, IN ?? ?? ???? ?? ??? ? ????. 5. ?? ? ? ?? ?? ?? ?? ??? ???? ??? ?? ??? ????????. 6. ???, ??, ?? ?? ?? ??? ??? ??? ?????. ?? ??, ?? ? 2023 ? ??? ??? "sh???.

MySQL?? ??? ??? ???? ??

MySQL?? ??? ??? ????? ?? ???? ?? ??????. 1. ?? ??? DropprocedureProcedure_name?? ??? ?? ?? ??? ???? ? ?????. 2. ??? ??? ???? ?? ??? ??? ??, dropprocedureifeifexistsprocedure_name? ???????. ?? ? ??? ??????. 3. ?? ???????? ??? ??? ????? dropprocedureifexistSdatabase_name.procedure_name; 4.? ??? ????? Alterroutine ?? Createrou? ?????.

MySQL ??? ?? ?? ??

SQL ??? ?? ? ?? : ????? ?????

sqlisastandardLanguageFormanagingRelationalDatabases, CommandScategorizedIntOddl (Create, Alter), DML (??, ????), DQL (Select), DCL (Grant, Revoke) ? TCL (Commit, Rollback)

SQL?? ?? ?? ?? ?? ??? ??????

usepercentile_cont (0.5) WithingRoup (OrderByColumn) InsqlServer, PostgreSQL15, Oracle, andSnowFlakeFlakeForAccuratemedianCalculation withinterPolation; 2.inmysql, ???? ??? ASSIGNOUNDINUMBERSUSUSUNUMBERSUSUSUNUMBERSUSSUNUMBERSUSSUNUMBERSUSSUSINUMBERSER ()

Cross Apply ? OUTER Apply Operator? SQL? ???? ??? ??????

CrossApplyReTurnsonlyRowWHERITHERTHETHETHERGESTERIETSHASRESULST, 1. CROSSAPPLYWORKSLIKEANINNERJOIN? ???? OUTERAPPLYRETURNSALLLEFT-SIDEROWS