SQL ????? ?? ??? ?? ??? ??????
tofindorphaneDrecords, usealeftjoinornoTexoTexistStoIndItifyHildRecordsWithOutmatchingParentRecords.forexample, selecto, formorderSoleftJoincustomerscono.customer_id = c.customer_idwherec.customer_idullesturnsorderdonon-allinternon-allernon-allernon-allernon-allernon-allistomer
Sep 17, 2025 am 04:51 AM
Oracle?? To_date ??? ???? ??? ??????
TO_DATECONVERTSASTRINGTOADATEINORACESINESPECIFIEDFORMAT.ITREQUIRESMATCHINGTHESTRINGFORMATECATCATCACTLYWITHFORMATEMETEMENTSICEYYYY , mm, dd, ormon; commonUsageIncludesconverting'2023-10-05'with'yyyy-mm-dd ', handlingdateswithmonthnames'05-oct-2023', andinclud
Sep 17, 2025 am 04:47 AM
Docker ?????? Redis? ???? ???
???? ???? ?? Docker? Redis? ???? Dockerrun ??? ?? ???? ??? ? ????. ?? ??? ??? ???? ????? ??? ?? ? ?? ??? ??? ? ????. ?? Redis-Data? ??? ???? ???? ?? ? ? ????. DockerCompose? ???? ?? ??? ?? ? ?? ??? ?????? ?? ????.
Sep 17, 2025 am 04:16 AM
MySQL ???????? ??? ?? ??? ?? ??? ??????
MySQL ???????? ??? ?? ??? ???? information_schema.routines ??? ?? showprocedurestatus ??? ??????. ?? selectroutine_name, lourtine_type, created, last_alternflfrominformation_schema.routineswheroutine_schema = 'your_database_name'androutine_type ='processure '?? ??
Sep 17, 2025 am 03:56 AM
????? SQL? ??? ???? ???? ??? ??????
?? ???? ??? ????? ?????? ???? ?? ??? ???????. 1. SQLServer? ??? ???? ??? ?? ? ?? select@var = column?? ?? ?????. 2. MySQL? selectColumninto@var ?? set@var = (subquery)? ?? ?????. 3. PostgreSQL? DO ?? ?? ??? ???? ?? ? ?? SelectIntovar? ?? ?????. 4. ?? ??? ?? ?? ?? ?? ???? ???? ??? ? ??? ???? IsNull ? ?? ??? ???? ???? ???? ?? ??? ???? ???? ??????.
Sep 17, 2025 am 03:53 AM
SQL???? ?? ??? ???? ??? ??????
PostgreSqlimplesmentsrlsviaPoliciesusingAltertableAdBreatePolicyToEnablerow-levelAccessControlbasedOnuserOrtEnantContext.2.SQLSERVERUSESSECURITYPREDICATES ? FUSTIONS ? INCREATSECURITYPOLYTOFILTERORBLOCKSDURINQUERIES.3
Sep 17, 2025 am 02:45 AM
SQL????? ??? ???
??? ???? ??? ????? ??? ???? ? ????. CreateView? ???? createViewit_employeesEselectName, SalaryFromeMployEESWherEdePartment = 'IT'? ?? ?? ??? ???? ?? ???? ??????. ?? ?? ?????*Fromit_employees? ??? ? ????. CreateOrreplaceView, DropView ??? ???? ?? ???? ???? ??? ?? ??? ?? ? ???? ?????.
Sep 17, 2025 am 02:30 AM
MySQL ??? ???? ??? ??? ??????
ThemySQLSERVERVERHASGONEAWAYERRORISCAUSIDBYCONNECTIONLOSSDUETOTIMEOUTS, LARGEQUERIES, ORCONFIGURINGLIMITS; FIXITBYINCERIESWAIT_TIMEOUTANDINGANTACTIVE_TIMEOUTTO28800, SETTINGMAX_ALLAKED_PACKETTO64MORHIRER, CLIENT-SERPOTIBLES, AVOI
Sep 17, 2025 am 02:26 AM
Oracle?? ?? ??? ???? ???
v $ ?? ? v $ SQL??? ???? Oracle?? ???? ??? ???. 1. SELLESS.SID, S.SERIAL#, S.USERIAL, S.STATUS, S.MODULE, S.Machine, S.Program, S.Machine, S.Program, sql.sql_textfromv $ sessionsjoinv $ sqlsqlons.sql_id = sql.sql_idwheres.status = 'active'ands.type ='user '. 2. ?? S.LAST_CALL_ET? ??????
Sep 17, 2025 am 01:12 AM
SQL?? Mod (Modulo) ???? ???? ??? ??????
themodoperatorcalculatestheremainderofadivision.use%inmysql/postgresql (? : 10%3 = 1) ormod (n1, n2) inoracle/sqlserver.ithelpsiden Tifyeven/OddNumbers (id%2 = 1forodd), Filtereverynthrow (row_number ()%n = 0) ? handlecyclicdata.behaviorwithnegativerbersvariesby
Sep 17, 2025 am 12:53 AM
phpmyadmin ??? ?????? ??
Howphpmyadminwasinwasinwasinwasinwinstalled (viapackagemanager, oraspartofastack likeampporwamp.2.ifusingapackagemanagemanageronagemanageronagemangeronageNubuntu/debian, runsudoaptupdateAndsudoaptupgraderReinstallsTallwithSudoAptInstall-reinstallphmyAdmin, thatTATREOTSREONSTREOPOSIONSTREOUTSEROUTSORIONGE)
Sep 17, 2025 am 12:33 AM
phpmyadmin ??? ??? ???
phpMyAdminlacksbuilt-inuseractivitytracking;monitoringmustbedoneatthedatabaseorwebserverlevel.2.EnableMySQL’sgeneralquerylogtorecordallqueriesandloginsbyeditingthemy.cnffileandsettinggeneral_log=1,butuseonlytemporarilyduetorapidloggrowth.3.UseSHOWFUL
Sep 17, 2025 am 12:29 AM
MySQL ?? ?? ? ???? ??
MySQL ?? ?? ? ?? ??? ??? ?? ? ?? ? ?? ??? ??? ?? ???? ???? ????. UTF8MB4? ?? ?? ??? ???? ???? ???? UTF8MB4_UNICODE_CI? ?? ?? ??? ?????. ?? ???? ??, ??????, ???, ? ? ?? ??? ???? ?? ???? ???????. UTF8MB4 ? UTF8MB4_UNICODE_CI? ???? ?????? ? ???? ??? ? ?? ??? ???? ?? ????. ShowVariables ??? ?? ?? ??? ??? ? ??? ??????. ?? ?? ?? ?? ??? ?? ???? ??? ?? ???, ?? ?? ?? ?? ?? ??? ? ????.
Sep 16, 2025 am 08:40 AM
SQL ???? 3 ? ??? ???? ???? ??? ??????
tojointhreeormoretablesinsql, chainjoinclausesstepbystep.eachjoinconnectstwotablessipsiredcolumns, commonjointinexttable.commonjointypesincludeinnerjoin? ?????
Sep 16, 2025 am 08:12 AM
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