SQL?? AVG ??? ???? ??
TheavgFunctionInsqlCalculatesTheAverage? asshowninSelectAvg (column_name) fromTable_name; itignOresNullSbyDefault, canbegroupedwithpuputoryspercepperceppercepperorgespperorgespperorgessperationsperceptresspperorgestepperorgestperorgestperorgestperorgestperorgestperouse
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MongoDB ??????? ???? ??
?? ???, ???? ??? ??, ??? ??? ? ???? ??? MongoDB? ?????? ?? ?????. ?? ??? ????? ??? ??? ???? ???? ??? ?? ???? ????. ??, ?? ????? ???? ??? Bindip ? ???? ?? ???? ??????. ?? ?? TLS/SSL ???? ????? ???? ???? ?? ??? ?? MongODB ?? ??? ?? REST?? ???? ??????. ????? ??? ????? ?????? ?? ??? ????? ????? ??? ?????? ?????? ??? ?????.
Sep 04, 2025 am 04:10 AM
MySQL?? ???? ??? ??
MySQL ???? ?? ???? ?? ??? ??? ???? ????? CreateUser? ???? ??? ??, ??? ? ????? ??? ?? Grant ?? ?? ?? ??? ???? ????? FlushPrivileges? ???? ?????. MySQL : MySQL-Uroot-P; 2. ??? ??? : CreateUser'Username '@'host'IndifiedBy'Password '; 3. ??? ?? : grantprivilege_typeondatabase_name.table_nameto'username'@'host '; 4. ??? ?? : ??
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SQL?? ?? ??? ?? ?? ??? ??????
sqlserver? eomonth () ??? ?????. 2.mysql ? Oracle ?? Last_day () ??? ?????. 3.postgresql? date_trunc + ???? ?????. 4.sqlite? ?? ??? ???? ??? ??? ?????. ?? ??????? ?? ?? ??? ???? ?? ??? ?? ???? ?????.
Sep 04, 2025 am 02:27 AM
phpmyadmin?? ?? ??? ?? ??
AccessTatStAbinphpmyAdminfromThePMenutoViewServiewSerVeRStatus.2. ReviewKeyMetricsUnderCategorsoriporiesLikeload, Connection, Traffic, QueryStatics, Tables, Buffers & Memory, Andinnodbstatusforreal-timeperformanceInsights.3.enableDeLiveReManupeArmanua
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Navicat? ??? ??? ???? ??? ??????
Navicat? ??? ?? ??? ??? ????? ? SQL ??? ?? ?? ? ? ????. ?? ?????? ??? ?? ?? ???? ?? "??? ????"?? "?? ??"? ??? ??? ???? ???? "??"??? ? ???, ??? ??, ??? ?? ? ?? ??? ?? ?? ???????. ??, "??"??? ???? ???? ???? ????? ?? PostgreSQL ???? SQL ?? PG_STATS??? ???? ?? ??? ?? ? ????. ????? ???? ??? ??? ???? ???? "?? ???"?? "?? ?? ???"? ???? ?? ??? ???? ?? ??? ???? ? ? ????. ?? ???? showtablestatus ?? selectrelpages, reltuples ? ?? SQL ??? ?? SQL ??? ?? ??? ? ????.
Sep 04, 2025 am 01:37 AM
SQL? ???? ?? ???? ??? ???? ???? ??? ??????
CTE? ???? SQL ??? ???? ?? ??? ?? ?? ? ? ????. 1. ???? ????? ?? ??? ??? ??? ?? ??? ???? ?????. 2. ??? ???? ???? ?? Active_users ?? Top_Products? ?? ???? ??? ??????. 3. ?? CTE? ?? ??? ?? ??? ??????. ?? CTE? ?? CTE? ?? ?? ? ???; 4. ? CTE ?? ??? ???? ??? ??? ??? ?? ???, ?? ? ?? ??? ??????. 5. CTE? ?? ?? ?????? ???? ????? ? ???? ??? ??????? ?? ??? ? ?? ? ? ????. ????? SQL? ????? ??? ???? ????? ????.
Sep 04, 2025 am 12:51 AM
Oracle ??????? ??????? ??
CheckCompatibility, ReviewupgradePath, BackupallDataAndrunthePre-upgradetool.2.fixDepRecatedParameters, GatherDictionaryStatistics, ResolveInValidObjectSandensuresUfficientsPace.3. UpgradeSingdBuaormanStartIngInupgrademodeanDeannningCatctl.4.
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phpmyadmin?? ??????? ???? ??
logintophpmyadminviayourbrowser.2.selectTargetDatabasefromtheleft handsidebar.3.clickthe "??"tabatthetop.4.scrollto "removedatabase (drop)"? ?? "Drop", thenconfirm.alternatially, usetheestqltabandrundropd
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Navicat?? ?????? ?? ?? ??? ???? ??? ??????
?????? ?? ??? ??? ???? Navicat? ?? ????? ?? ? ? ??????. 1. ?? ?? ? ?? ??????, "??"? "?? ??"??? ?? ?? ? ?? ??? ?????. 2. ???? ???? ?? ? ? ???? ????? ??? ????? ?? ??? ??? ?? ??? ??????. 3. "?????"? "?? ???"? ???? ??? ???? ?? ?? ?? ??? ?????. 4. "?? ???"??? ?? ??? ?? ???? ???? ?? ?? ??? ????????.
Sep 04, 2025 am 12:17 AM
MySQL?? ??????? ???? ??
USETHEUSEDATABASE_NAME; COMMANDABASE_NAME, COMMANDECTADATABASEINMYSQL, ?? DATABASE_NAMEWITHTHEDERDEDDATABASE.2.listAvailableABaseSwithShowDatabaseSHOWDATABASES.3
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?????? ????? ??????
PartitioningInoracleImprovesperferferferferferferferferferformance, ?? ??? ? AvailabilityforlargetableSmintoSMaller, QUOCHYSEGMERSMALLER
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SQL? ???? ??? ???? ??
SQL? ???? ??? ????? ?????? ???? ?? ??? ???????. Selectyear ( '2025-04-05')? ?? MySQL, SQLServer ? MariaDB?? ?? () ??? ???? 2025 ?; PostgreSQL??? 2025 ?? SelectExtract (Yearfom'2025-04-05 ':: Date)? ?? ?? SQL? ??? (?? ...) ??? ???????. PostgreSQL? ?? date_part ( 'Year', Date)? ?????
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Oracle?? ???? ?? ???? ?? ??
enablemonitoringwithalterindexschema.index_mameonomonitoringusage; 2.RunnormalworkloadforarePresentativePeriod; 3.checkv $ ??_usageforused = 'no'toidentifyunusedIndexes; 4.DisableMonitoringViaalterIndexSchema.index_namonitoringusage;
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