MySQL?? ?? ? ??? ????? ?????? ??? ??????
MySQL? ?? ? ??? ????? ??????? ?? setforeign_key_checks = 0? ???????. ?? ??? ??? ????. 1. SETFOREIGN_KEY_CHECKS = 0; ??? ???????. 2. ??? ?? ?? ??? ??? ?? ?? ??? ?????. 3. SETFOREIGN_KEY_CHECKS = 1; ??? ?? ??? ? ? ????. ? ??? ?? ???? ??? ??? ??? ???? ???? ?? ???? ?????? ??? ???? ??? ?????? ???????. ?? ?? ???? ????? ?? ??? ?? ? ? ????.
Aug 20, 2025 pm 03:32 PM
??? ???? ? ??????? MySQL ???
tooptimizemysqlfordataarchivingandhistoricalRicoricalRopporting, FirstSeparateActiveAndHistoricalData, then ApplySpecializedStorageAndIndexingStrategies.1.ArchiveOldDatabyPationingTablestablesTibstable, MovietHistoricalDataDatedTablestAbaseSUSUSUSUSUSUSUSUSUSUSUSUISURI
Aug 20, 2025 pm 02:08 PM
MySQL?? group_concat () ??? ??????
Group_Concat ()? MySQL?? ?? ? ?? ?? ???? ???? ? ?? ??? ???? ????? ? ?????. ?? ??? group_concat (column_name [orderByColumn_Nameasc/desc] [separtor'Custom_Separator '])?? ????? ??? ?????. Orderby ??, ??? ??? ?? ???, ??? ?? ??? ???? Group_concat_max_len ??? ??? ?? ?????. ???? 1024 ??? SetSessiongroup_co? ?? ? ? ????.
Aug 20, 2025 pm 01:43 PM
MySQL?? ?? ???? ???? ??
replaceinmysqldeletesandinsertsarowifaduplicationuniquekeyexists, thrathanupdatingit.2
Aug 20, 2025 pm 12:19 PM
MySQL?? ?? ??? ???? ??
auto-incrementinmysqlautomicallygeneratesuniqueIndifiersforprimarykeys.1.defineauto_incrementintablecreationwithaprimarykeyintegercolumn.2.insertrowspecificingtheauto_incrementcolumnbyomittitit, indull, Ordefault.3.
Aug 20, 2025 am 11:23 AM
MySQL ???? ??? ?? ???? ??
??? MySQLConnector? ???? ???? ???? ?? ???? ?? ? ??? ?? ? ? ????. ?? ? ??, ?? ??? ? ?? ? ???? ?????????. 1. ???? ??? ???? ?? Connector/Java, Python? ???/???? ?? ??? ?? ????? ???? ???? ??????. 2. ?? ? (? : hikaricp, sqlalchemy)? ?? ??? ??? ???? ?? ?? ?, ?? ?? ?? ? ?? ?? ?? ??? ????? ???? ??? ???????. 3. ?? ?? ??? ? ??? ???? SQL ??? ???? Cursor.Execute ??? ?? ?? ?? ???? ?????? (& python in python.
Aug 20, 2025 am 10:38 AM
MySQL?? ??? ??? ???? ??
Groupby? ??? ???? ??? ? ? ???, ?? ??? ?? COUNT () ? SUM ()? ?? ?? ??? ?? ? ? ????. 2. ?? ??? ??? ? ?, ??? ?? ?? ??? ?? ???? ? ??? ??? ?????. 3. ?? ??? ??? ? ? ?? ?? ?? ? ?? ?? ??? ??????. 4. ????? ?? ?? ????? ? ???? ?? ? ??? ? ?? ??? ????? ? ?????. 5. Only_full_group_by ??? ????? Select? ? ?? ?? GroupBy? ???????. ??? ??? ?? ??????. ??? GroupBy? ??? ?? ???? ???? ?? ? ??? ???? ?? ?? ??? ???????.
Aug 20, 2025 am 07:44 AM
MySQL ???? ???? ?? ??? ???? ??? ??????
mysqldoesnotenforcepasswordexpirationBydefault; youMustConfigureItmanallyStyBuilt-Infeatures.1.SetAgloBaleXpirationPolicywithSetGloBaldEfault_Password_Lifetime = 90; andConfiguredefault_Password_Lifetime = 90inmy.cnfforpersistence.2
Aug 20, 2025 am 07:37 AM
MySQL?? ???? Information_schema.tables View? ??????
theinformation_schema.tablesviewinmysqlprovidesmetadataaboutAlltablesandviews, schemas, ??, StorageEngines, rowCounts ? size; itisessentialdertiveAtAbaseInspection, AdministationVeTasks ? Tooldevelopment, witheycolumnsinclu? ?????
Aug 20, 2025 am 06:33 AM
MySQL? ??????? ??? ???? ??
useshowdatabases like'database_name'toquicklychecklyCeckforadatabase'sexistencename, returningAresultifitexists; 2.queryInformation_schema.schematawithSelectschema_namefromInformation_schema.schematawhereschema_name = 'database_name valepromallyallyforlyferifeec
Aug 20, 2025 am 04:19 AM
MySQL? ?? ??? ? ???? ???? ??? ???? ??? ??????
MySQL ??? ??? ??? : MySQL-Uroot-P ??? ???? ????? ???? MySQLShell? ??????. 2. ? ??? ??? : CreateUser'UserName '@'host'IndifiedBy'Password '? ??????. ??? ??, ??? ? ??? ????? ?????. 3. ??? ?? : grantpermission_typeondatabase_name.table_nameto'username'@'host '; All -Privileges, Select ?? ?? ??? ??? ?????. 4. ?? ?? ?? : Flush -Privileges? ??????.
Aug 20, 2025 am 04:11 AM
MySQL?? ?? ???? ???? ??? ??????
?? ???? MySQL?? ?? ??? ??? ?? ?? ??? ??? ???? ? ???? ????? ?? ???? ?????. 1. CreateTemporaryTable? ???? CreateTemporaryTableTemp_sales (idintprimarykey, molleddecimal (10,2), sale_datedate)? ?? ?? ???? ????. 2. ?? ???? ?? ??? ???? ??? ?? ? ?? ???? ?????. 3. ?? ???? ?? ?? ??? ??? ?? ?? ?? ??? ??? ?? ?? ???? ??? ? ??? ??? ????? ???????. 4. ??? ??????? ???, ?? ? ? ?? ??; 5. ??? ?? ?? ??? ????? ?????
Aug 20, 2025 am 03:45 AM
MySQL?? ?? ??? ??? ??
ToTepatialIndexInmysql, ustheespatialkeywordwithrecreateindexonaspatialcolumn.2.ensurethetableusesinnodbormyisamstorageEngine, Innodbrecemended.3.thecolumnmustbeofspatialtype (? : Point, Linestring, Polygon, geometrety) ? defined
Aug 20, 2025 am 01:29 AM
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