
SQL? ???? ?? ??? ???
SQL?? ???? ????? Droptable ?? ???????. 1. ?? ??? droptabletable_name?? ??? ?? ? ???? ????? ??? ? ????. 2. ???? ???? ?? ? ??? ???? ?? DroptableIfexists? ???? ??? ?? ? ? ????. 3. ?? ??? ??? ? ??? ???? ?????? ???????. 4. ?? ?????? ??? ???? ???? ?? ??? ???????. 5. ?? ??????? ?????? ????? ?? ??? ????? ?????? ? ??? ???? ?? ???? ?? ?? ???????.
Aug 08, 2025 pm 02:46 PM
?? ?? ?? ??????? MySQL ???
GOOGLEOCS? ??? ?? ?? ?? ????? ????? MySQL ???? ?? ??, ?? ??, ??? ?? ?? ???????. ??, ?? ?? ? ?? ??? ???? ?? ??? ??? ??? ???? ?? ??? ??????. ??, ???? ??? ???? ????? Row Lock ??? ??? ?? ?? ?? ??? ?? ??? ??? ?????. ??, (document_id, timestamp) ?? ???? ???? ??? ?? ?????. ??, ?? ?? ?? ????? ????? ?? ?? ? ?? ??? ??????. ???, ?? ?? ?? ?? ?? ?????? ??? ??? ????? ??????. ??? ??? ?? ????? ?? ? ? ??? ???? ???? ? ????.
Aug 08, 2025 pm 02:41 PM
SQL? Alter Table ?? ??????
THEALTERTABLESTEMENTISUSSISSESSEDTOMODIFYANESISTINGTABLE 'SSTRUCTURES? OUTRECREATINT; 1. ADDANEWCOLUMNUSINGADDCOLUMN; 2. DROPACOLUMN withdropcolumn, whithalsodeletesitsdata; 3. renameacolumnusingrenamecolumn, withyntaxconsistentinmysql, sqlserver, andpostgresql; 4
Aug 08, 2025 pm 02:13 PM
SQL? ?? ???? ???? ??? ??????
themergestementinsqlenableSconditionaldatasynchronizationberformingInsert, ????, OrdEleTeOperationsOnattableBasedonMatches? ?? whyousourcedataset.1)
Aug 08, 2025 pm 02:12 PM
SQL?? ?? ?? ???? ?? ?? ?? ? ?? ?? ??? ??????
TheoutPutClaUseCapturesDataAffectedBydMloperations : useInsertedToretRievenewValuesafterInsertorUpdate; 2.usedELETEDTOCAPTUREOLDVALUESBEFOREDELETEORUPDATE; 3. ComcomBineInsertedEntEdEnupDateStatementStotRackbefore ? -Afterchanges; 4. REDIRCTROUTTRETULTREFOLTRETULTRETULTROUTTROUTTROUTTROPTROUTTROUTGENTROUTTROUTGELTROUTTROUTTROUTTROUTT
Aug 08, 2025 pm 01:45 PM
PAM (Privileged Access Management)?? MySQL ??
MySQL? ?? ?? ????? ???? ??, ?? ? ??? ?? ? ?????? ????? ??? ? ??? ?? ????? ? ???? PAM? ?????. 1. PAM? LDAP, RADIUS ?? KERBEROS? ???? ?? ??? ?? ? ? ????. 2. ?? ??? ???? ??? ??? ?????. 3. OTP? ?? ??? ?? ??; 4. ??? ?? ? ?? ??. ?? ? ?? ????? ???? PAM ?????? ???? ??? ?? ? ?? ??? ???????. ??? ??? ?? ??, ?? ???, ?? ?? ? ?? ???? ??? ???? ??????.
Aug 08, 2025 pm 12:22 PM
JSON ???? MySQL? ???? ???? ??? ??????
MySQL5.7 ??? ???? JSON ??? ??? ?? JSON ???? ?? ???? ??????. 2. JSON ? ?? ???? ???? ??? ? JSON ???? ???? MySQL? ???? ???? ?????. 3. -> ? -> ???? ???? JSON ?? ?? ????, ?? ->>? ??? ?? ??? ???? ???? ? ??? ? ????. 4. JSON_CONTAINS, CAST ?? ?? ??? ?? ????? ??? JSON ???? ???? ?? ???? ?? ??? ?????. 5. JSON_SET, JSON_REPLACE ? JSON_REMOVE ??? ???? JSON ??? ??????. 6. ?? ? ?? ???
Aug 08, 2025 pm 12:02 PM
SQL Server? ?? ???? ???? ??? ??????
pivotinsqlservertransformsaintocolumnsbyagatingValuesandatinguniqueEntriessfromoneColumnIntOneWcolumnHeaders, IdeverCreatingSummmaryReports.ItperformsthreeOperations : AggregationUsingFunctionsLikESumorCount, GroupingBynon-pivotedcolumns ? and and and ?
Aug 08, 2025 am 11:44 AM
MySQL?? '?? ?? ??'??? ???? ??
CheckMax_ConnectionsandThreads_ConnectedToconFirmTelImitAndCurrentUsage.2.increaSeMax_ConnectionStemporallyWithSetGloBalOrperManentlEnterViamy.cnf/my.ini.3.3USECONCENCEPLING, CloseConnectionSpolly, and ManagePersistentConnectionsinThopation.4
Aug 08, 2025 am 11:37 AM
MySQL?? ??? ?? ?? ??? ???? ??
define inffeenkysduringtablecreceusing withreferences and specifyondelete/onupdateActionslikeCascadeTomainTainTainTainEtaineReferentialInTegrity.2.addoreignkeyConstraintStoExistingTablesTablesViaAltertablewithAddcondEntexe
Aug 08, 2025 am 11:26 AM
Lua ????? Redis? ? ??????
LUA ????? ??? Redis??? ??? ???? ??, ???? ??? ??? ??? ?? ???? ??? ??????. ?? ??? ?? ??? Aval ?? EvalSha ??? ?? ????? ????? ??? ?? ??? ???? ??? ??? ??? ?????. 1. ?????? ?? ?? ?? ?? ????. 2. ???? ? ?? ??? ?? ??? ??????. 3. ??? ????? ?? ?? ??? ??????. ?? ? ? ?? ??? ??????. ????? ???? ??? ????, ??? ??? ???, ?? ??? ????, ????? ??? ?????,???? ??? ?????. ?? API? ??, ? ?? ?? ?? ?? ? ??? ?? ??? ??? ?????? ???? ????.
Aug 08, 2025 am 10:39 AM
?? SQL?? null ? ?? ???? ???? ??? ??????
Coalesce () ??? ???? ?? ???? ?????? ????? ???? ??? NULL ?? ???? ???? ???? ?? ???? ?????. 1. Database Portability? ??? ?? Coalesce (column_name, 'default_value')? ??????. ?? PostgreSQL, SQLServer, MySQL, Oracle ? SQLITE? ?????. 2. SQLServer ? ???? ?? iSnull (column_name, 'default_value'); 3. MySQL ? ???? ifnull (column_name, 'default_value');
Aug 08, 2025 am 10:30 AM
SQL? ?????? ???? ??????
ViewSareVirtualTablesBasedOnAselectQuery, usedTosimplifyqueriesorRestrictAccess, whileFunctionsAblerOUBEROUTINSTHERTEREBALUERRESULTSET.2.VIEWSCANNOTACCEPTPARAMETERS, while while while while while while while while while while-whilectionscan.3
Aug 08, 2025 am 10:19 AM
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