MySQL?? ??? ?? ?? ??? ???? ??? ??????
OutsewneyConstraintSinMySqlMaintainTreferentileTegrityBalIdRelationSbetWeThibleStable;
Aug 29, 2025 am 12:25 AM
MySQL? max_connections ??? ??????
Max_ConnectionsInMySQLSETSTSETEMAXIMUMUNMUNMERFSIMULTINGCANNECTIONSTERVERCANHANDLE, withatyPicalDefaultOf151.1) theValueIsAdjustableViaconFigurationFileOrdyNamicalSUSSETGGLOBALMAX_CONNECTIONS.2) CONSKITREUSSUFFICENTSYSTEMRESLESTEMRESLESTERSL
Aug 28, 2025 am 08:19 AM
MySQL?? ???? ???? ??
MySQL?? ?? ?? ???? ??? Case ?? ?? GroupBy? ?? ? ? ????. 1. ?? ?? ?? : ? ? ??? ??? ?? ? (Casewhen); 2. ? ?? max? ?????? : ?? ?? ??? ???? ??? ??? ?? ?? ?? Max? ??????. 3. ?? ??? ? : ? ?? ? ??? ?? Group_Concat? ???? ?? SQL? ???? ??????. 4. ?? ?? : ????? ??, ? ?? ???, ???? Max? ????, ???? ??????. 5. ??? ??? ? : MAX (CASE)? ???? ??? ?? ??? ?????. ?? ?? ?? ??? ??? ?? ??? ??? ?? ???? ??? ? ???, ????? GroupBy? ???? ??? ??? ???? ?? ?? ??? ?????.
Aug 28, 2025 am 08:06 AM
MySQL?? auto_increment ? ??????
auto_incrementinmysqlautomicallygeneratesauniqueintegerforacolumn, ????? Primarykeys, AbsureathNewRowreceivesSaseSASESASEETIFIERSTHINGOUNINTIFIER; ITREQUIRESTHECOLUMNINTEGER, NOTNULL ? INDEXEDED, allenlyOnepertable, incrementSepertable
Aug 28, 2025 am 07:35 AM
?? MySQL ??? ?? SSL/TLS? ???? ??
CheckSslstatususingshowvariables? ?? '%ssl%'; indrave_sslisyesandsssl_ca, ssl_cert, ssl_keypointtovalidfiles; verifyconnectionwi thshowstatus 'ssl_cipher'; 2. generatesslcertificatesusingopensslbycreatingacawithopensslgenrsaandopensslreq, Generateser
Aug 28, 2025 am 06:45 AM
MySQL? ??????? ?? ???? ???? ??
USETHESESTATEMENTTOSELECTADATABASE, ?? YOUR_DATABASE_NAMEWITHTHEACTUALNAME : USEYOUR_DATABASE_NAME; 2.RUNSHOWTABLES; TOLISTALLTABLESINTHESELECTEDDATABASE.3
Aug 28, 2025 am 02:25 AM
MySQL?? ?? ?? ??? ????? ??
CheckCurrentStatusUsingshowvaribles like'General_log '; ifoff, reserv.2
Aug 28, 2025 am 01:56 AM
MySQL?? ???? ???? ???? ??
?? ??? ??? ???? ??? ??? ?????? ?? ?? ??? ?????? ?? ?? ??? ??? ????? ??? ? ?? ??? ?????. 2. ???? ???? ???? ?????? ??? ??????. MyISAM ???? ? ??? ????. InnoDB? ????? ???? ????? ??? ?? ????. ?? ??? ?? ??? ??? ? ????. 3. ??? ???? RepairTable? ???? MyISAM ???? ??????. InnoDB? innodb_force_recovery ?? ??? ?? ?? ? ?? ???? ?? ?? ??? ???????. 4. ?? ???? ?? ?? ??, InnoDB? ?? ?? ?? ? MySQLCheck ??? ?? ??? ? ??, ?? ? ?? ??? ?????.
Aug 28, 2025 am 01:41 AM
MySQL?? ?? ???? ??? ??? ??????
?? MySQL ???? ???? CreateMporaryTable ?? ??????. 1. ???? ?? ???? ???? ??? ?? ? ???? ?????. 2. ?? ???? ?? ??? ?? ? ??? ?? ?????. 3. ???? ???? ??? ????? ??? ???? ?? ??? ???? ???? ????. 4. ?? ????? ???? ???? ?? ? ? ??????. 5. ??? ?? ???? ???? ??? droptemporarytable? ???? ??? ? ????. ??? ??, ??? ??? ?? ? ?? ????? ???? ?? ?? ? ?? ?? ??? ?????.
Aug 28, 2025 am 12:29 AM
MySQL?? ??? ?? ??? ???? ??
MySQL? ??? ?? ?? ??? ?? ???? ?? ???? ???? ?? Locktables ? UnlockTables ??? ?? ?????. 1. ?? ??? ???? ???? ?? ???? ?? ?? ?? ??? ???? ?? ?? ??? ??? ?????. 2. ?? ?? ??? ???? ?? ?? ??? ??? ?? ???? ????. 3. ??? ??? ???? ?? ?? ?? ??? ??? ???????. InnoDB?? Locktables? ?? ????? ?? ??? ??? ???, ???? ?? ??? ??? ?? ???? ?? ??? ?????, ??? ??? ???? ?? ???? ??? ?? ??? ?? ??? ???????. ??? ?? ??? ?? ?? ?? ? ?? ?? ??? ?? ?? ?????? ?????. ?? ? ?? ??? ????? ?? ?? ???? ???????.
Aug 27, 2025 am 08:11 AM
MySQL?? ???? ?? ??? ??
MySQL?? ???? ????? Droptrigger ?? ??????. 1. ?? ??? droptrigger [ifexists] [schema_name.] trigger_name???. 2. ???? ???? ??? ??? ?? ? ? ????. 3.Schema_name? ?? ???????? ?? ? ? ????. 4. ?? ?? ?? ??? ????????. 5. ???? showtriggers ?? information_schema.triggers? ?? ????? ?? ??? ? ????. ?? ??? ?? ???? ??? ??? ??? ????? ??? ????. ?? ? ???? ?????.
Aug 27, 2025 am 08:05 AM
MySQL?? JSON ??? ?? ??
MySQL? ???? JSON ???? ?? ? ? ?? JSON ?? ?? ???? ??? JSON ???? ???????. 1. -> ? -> ???? ???? JSON ?? ???? ->> ???? ???? ?????. 2. WHERE ??? ???? ?????? ->> ?? JSON_Extract? ??????. JSON_CONTAINS_PATH? ???? ?? ????? ???? JSON_CONTAINS? ???? ?? ?? ??????. 3. json_set, json_replace ?? json_insert? ???? JSON ??? ?????? JSON_ARRAY_APPEND? ??? ??? ?? ? ? ????. 4
Aug 27, 2025 am 07:55 AM
MySQL? ?? ??? ???? ??????
?, CheckConstraintSareEnforcedinmysqlstartingfromversion8.0.16.Priortothisversion, CheckConstraintswereparsedButnotenforced, ?? theyhadnoeffectondataintegrity.frommysql8.0.16onward, checkconstrinatereact attthatthesqllayerd
Aug 27, 2025 am 07:40 AM
MySQL?? ?? ???? ??? ??????
TheUSEstatementinMySQLselectsadefaultdatabaseforthecurrentsession,allowingsubsequentoperationstobeperformedwithinthatdatabasecontextwithoutneedingtofullyqualifytablenames;forexample,runningUSEsalessetsthesalesdatabaseasdefault,soquerieslikeSELECTFROM
Aug 27, 2025 am 07:02 AM
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