SQL?? ?? ??? Like ???? ???? ??? ??????
SQL? ??? ???? ??? ???? ??? ???? ? ???? ?? ??? ? ??? ?????. ?? ?? ?????? ??? ?????. 1. ?? 'John ","Jane "?? ?? ?? ??? ???? ??? ??; 2. '%book%'?? "???", "???"?? ?? ?? ?? ???? ?? ? ??? ??; 3. ?? 'AB3 ","AC3 "?? ?? ??? ??? ???? ?; 4. ??? ??? ???? ??? ??? ????
Aug 08, 2025 am 10:14 AM
MySQL?? ?? ??????? ???? ??
MySQL? ?? ??????? ????? ShowDatabases ??? ???????. 1. MySQL ??? ??? ? ? ShowDatabase? ??? ? ????. ?? ???? ??? ? ????? ?? ??????? ????? ??. 2. Information_Schema, MySQL, Performance_Schema ? SYS? ?? ??? ??????? ????? ????? ??? ??? ?????? ? ? ?? ? ????. 3. SelectSchema_namefrominformation_schema.schemata? ?? ??????? ???? ??? ? ?? ????. ?? ??, ???? ?? ?????? ? ????? ??? ??????? ?????. ??????
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phpmyadmin?? ??? ??? ??
tochangethelanguageinphpmyadmin, selectyourpreredllirfforgefromthepdownontheloginscreenbeforeLoggingin; 2.ifalreadyLoggedin, "??"??? ??????.
Aug 08, 2025 am 09:39 AM
SQL?? ?? ? ??? ??? ???? ?? ?? ??? ??? ??????
totraverseahierarchicalDattructureInsql, useareCursiveCommontableExpression (cte)
Aug 08, 2025 am 09:38 AM
phpmyadmin?? ?? ??? ??? ???? ??
changetheTatAtypeofacolumnInphppyAdminastrawardProcess.youcandoSusingThegraphicalInterfacewithWritingsqlCommands, thitwhitingsqlcommands, bothmethodsareavailable
Aug 08, 2025 am 09:16 AM
MongoDB? ??? ??? ??
???? ??? ???? ?? ?? ????? ?? ?? ??? (? : ??? ??); 2. ?? ??? ???? ?? ????? ???? ??? (? : ??)? ?????. 3. ?? ??? ???? ??? ???? ??? ??? (? : ??)? ?????. 4. ?? ?? ? ??? ???? ??? ?? ?? (? : ? ??? ??)? ???????. ??? ?? ??? ?? ?? ??? ??? ???? ??????? ?? ? ?? ?? ??? ???????.
Aug 08, 2025 am 08:29 AM
MongoDB? ?? ??? ???? ??? ??? ??????
indexesimproveMongodBqueryPerformanceByrescansandResourceUsage.withoutIndexes, mongodbperformsfullcollectionscans, whitheslowandineficits.IndexAllowDirectAccesstorELevantDocumentSusingb-trees, speedingueplookups, rangequerifies, andsort
Aug 08, 2025 am 08:27 AM
MySQL?? ??? ??? ??? ???? ??
ByDefault, MySqlPerformScase-insensitivesElectQueriesDuetocase-insensitiveCollations likeUtf8mb4_general_ci; 1.uselower () Orupper () functionStoconvertBothcolumnandSearchValuetoTheSamecase, ??? THISMATINTUMUTUCTOUTOUTINCOUTINGOUTINGOUTENTOLIKETOLIKETOLIKETOLIDEXES
Aug 08, 2025 am 08:25 AM
MySQL ?? ??? ???? ??
CheckResplicationStatusUsingShowsLavestatus \ g, verifyingslave_io_rio_runningandslave_sql_runningareyes, despectinglast_errorandseconds_behind_masterforissues.2.forslave_io_io_io_io_io_io_io_io_io_io_io_io _io_io _io_io_io _io_io, ResolveConnectionProblemsconfirming Mas
Aug 08, 2025 am 08:15 AM
MySQL? where ?? ???? ??? ??????
wheretofilterindibluallowsbe -Grouping, asitoperatesonsonrawdataandimprovesperformancesporformance excludedwantedrowsearly;
Aug 08, 2025 am 08:05 AM
SQL? while ??? ???? ???
SQL ??? ?? ???? ??? ???? ??? SQLServer ? MySQL? ?? ??????? ?? ?? ?? ?? ?????? ??? ?????. 1. SQLServer?? t-sql? while ??? ??? ?? ??? ???? ???? ??????? ... ?; 2. MySQL?? ??? ???? ?? ??? ??? ?? ??? ?? ?????? ???????. 3. ?? ?? ????? ??? ? ??? ?? ?? ?? ?? CTE? ?? ???????. 4. PostgreSQL, Sqlite ? Oracle? ??? ???? ??? ??? ?? ??? ???????. ????
Aug 08, 2025 am 07:43 AM
?? ??????? SQL ???? ? ? ?? ???
SQLProfiler? ?? ???? ???? ExtendedEvents? ?? ????? ? ?????. SQLPROFILER? ??? ??? ?? ??? ???? ?? ???? ? ?? ?? ? ??? ?? ?? ??? ????? ?? ???? ???? ???? ???????. ExtendeDevents? ?? ??? ?? ???? ??? ?? ??? ? ??? ?? ???? ???? ?? ???? ?? ??? ?????. ?? ??? ????? ?????????. ?? ???, ?? ?????? ?? ??? ???? SSMS ???? ?? ??? ??? ? ? ????. ???? ???, ?? ?? ? ??? ?? ?? ?????????.
Aug 08, 2025 am 07:37 AM
phpmyadmin?? ?? ??? ???? ??
EnumInphpmyAdminisusedTorestrictacolumntopredStringValues.1. OpenphpmyAdmin, selectyourdatabase, and leithercreateanewtableorditanexistingone.2.definethecolumneatingthename, selectingeenumfromthetypedropdown, andinputtinghord allowerdvaltupote
Aug 08, 2025 am 07:15 AM
MySQL ??? ?????? ?? ??? ???? ??? ??????
?? ?? ??? ????? ?? ???? ?? ? ??? ??????. slow_query_log, long_query_time, log_queries_not_using_indexes ?? ??? ???? PT-Query-ougest? ???? ??? ???? ? ??? ??????. 2. Performanceschema ? Information_schema? ???? ?? ??? ?? ??? SQL ?, ? I/O ?? ? ?? ???? ??? ?? "SendingData"?? "??"??? ???? ????? ????. 3. ??? _running ? innodb_r? ???????
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