MySQL?? ?? ? ???? ??? ??????
TheDISTINCTkeywordinMySQLremovesduplicaterowsfromqueryresults,returningonlyuniquevaluesbasedontheselectedcolumns;itworksbytreatingrowsasduplicatesonlyifallselectedcolumnvaluesareidentical,includingNULLsasequal,andisappliedtosinglecolumnstoeliminatere
Sep 04, 2025 am 07:15 AM
SQL?? ????? ???? ??
AsqltransactionissinglolegicalUnitofwork that attensuresDataintegrityFollowingAcidPrinciples : ???, ???, ?? ? ???; 2.TransactionSArctionArecontrolledusingBegin (OrstartTransaction), CouternSeveChanges, AndrollbackToundothem;
Sep 04, 2025 am 07:09 AM
MySQL?? ?? ??? ???? ??
curtime () returnsthecurrenttimeinhh : mm : ssformatwithoutThedate; 1.useSelectCurtime () TOGETECURRENTSYSTEMTIME; 2. includePrecisionArgumentlikeCurtime (3) ForfractionEcondSuptomicroseconds; 3.insertcurtimecolecolecolecolecolecolecolecodecolecordecodecodecordecordecodecordecord.;
Sep 04, 2025 am 06:51 AM
MySQL?? NULL ?? ???? ??? ??????
useNullOrisnultNullTocheckFornUllValuesBECAUSESTANDARDERCOMPARISONSWITH = ??! = ret???
Sep 04, 2025 am 06:47 AM
MongoDB?? ??? ???? ???? ??
DatamaskingInMongodbisachievestroughpplication ??? ??, ?? ?? ? ?? ??datagenerationtoprotectsenitiveinformation.first, DistinguishIshing-Maskingfromencryption : maskingiregiberiversilly Replacessendatawithrealfakevalues,
Sep 04, 2025 am 06:38 AM
?? SQL? ?? ? ?? ? ?? ???? ??? ??????
?? ? ???? ?? ?????? ?????? ??? ?? ???? ???????. 1.mysql? ???? whereyour_columnregexp '^[0-9] $'; 2.postgresql? wheryour_column ~ '^[0-9] $'? ?????. 3.sqlserver? wheryour_columnnot like '%1%'andyour_columnisnollandyour_column '; 4.sqlite? ?? ? ?? ?? ?? ??? ?????? ?? ????. ? ??? ? ?? ?? ?? ? ???? ??? ?? ??? ???? ??? ? ?? ????????. 0-
Sep 04, 2025 am 04:45 AM
SQL?? AVG ??? ???? ??
TheavgFunctionInsqlCalculatesTheAverage? asshowninSelectAvg (column_name) fromTable_name; itignOresNullSbyDefault, canbegroupedwithpuputoryspercepperceppercepperorgespperorgespperorgessperationsperceptresspperorgestepperorgestperorgestperorgestperorgestperorgestperouse
Sep 04, 2025 am 04:26 AM
MongoDB ??????? ???? ??
?? ???, ???? ??? ??, ??? ??? ? ???? ??? MongoDB? ?????? ?? ?????. ?? ??? ????? ??? ??? ???? ???? ??? ?? ???? ????. ??, ?? ????? ???? ??? Bindip ? ???? ?? ???? ??????. ?? ?? TLS/SSL ???? ????? ???? ???? ?? ??? ?? MongODB ?? ??? ?? REST?? ???? ??????. ????? ??? ????? ?????? ?? ??? ????? ????? ??? ?????? ?????? ??? ?????.
Sep 04, 2025 am 04:10 AM
MySQL?? ???? ??? ??
MySQL ???? ?? ???? ?? ??? ??? ???? ????? CreateUser? ???? ??? ??, ??? ? ????? ??? ?? Grant ?? ?? ?? ??? ???? ????? FlushPrivileges? ???? ?????. MySQL : MySQL-Uroot-P; 2. ??? ??? : CreateUser'Username '@'host'IndifiedBy'Password '; 3. ??? ?? : grantprivilege_typeondatabase_name.table_nameto'username'@'host '; 4. ??? ?? : ??
Sep 04, 2025 am 02:42 AM
SQL?? ?? ??? ?? ?? ??? ??????
sqlserver? eomonth () ??? ?????. 2.mysql ? Oracle ?? Last_day () ??? ?????. 3.postgresql? date_trunc + ???? ?????. 4.sqlite? ?? ??? ???? ??? ??? ?????. ?? ??????? ?? ?? ??? ???? ?? ??? ?? ???? ?????.
Sep 04, 2025 am 02:27 AM
phpmyadmin?? ?? ??? ?? ??
AccessTatStAbinphpmyAdminfromThePMenutoViewServiewSerVeRStatus.2. ReviewKeyMetricsUnderCategorsoriporiesLikeload, Connection, Traffic, QueryStatics, Tables, Buffers & Memory, Andinnodbstatusforreal-timeperformanceInsights.3.enableDeLiveReManupeArmanua
Sep 04, 2025 am 02:25 AM
Navicat? ??? ??? ???? ??? ??????
Navicat? ??? ?? ??? ??? ????? ? SQL ??? ?? ?? ? ? ????. ?? ?????? ??? ?? ?? ???? ?? "??? ????"?? "?? ??"? ??? ??? ???? ???? "??"??? ? ???, ??? ??, ??? ?? ? ?? ??? ?? ?? ???????. ??, "??"??? ???? ???? ???? ????? ?? PostgreSQL ???? SQL ?? PG_STATS??? ???? ?? ??? ?? ? ????. ????? ???? ??? ??? ???? ???? "?? ???"?? "?? ?? ???"? ???? ?? ??? ???? ?? ??? ???? ? ? ????. ?? ???? showtablestatus ?? selectrelpages, reltuples ? ?? SQL ??? ?? SQL ??? ?? ??? ? ????.
Sep 04, 2025 am 01:37 AM
SQL? ???? ?? ???? ??? ???? ???? ??? ??????
CTE? ???? SQL ??? ???? ?? ??? ?? ?? ? ? ????. 1. ???? ????? ?? ??? ??? ??? ?? ??? ???? ?????. 2. ??? ???? ???? ?? Active_users ?? Top_Products? ?? ???? ??? ??????. 3. ?? CTE? ?? ??? ?? ??? ??????. ?? CTE? ?? CTE? ?? ?? ? ???; 4. ? CTE ?? ??? ???? ??? ??? ??? ?? ???, ?? ? ?? ??? ??????. 5. CTE? ?? ?? ?????? ???? ????? ? ???? ??? ??????? ?? ??? ? ?? ? ? ????. ????? SQL? ????? ??? ???? ????? ????.
Sep 04, 2025 am 12:51 AM
Oracle ??????? ??????? ??
CheckCompatibility, ReviewupgradePath, BackupallDataAndrunthePre-upgradetool.2.fixDepRecatedParameters, GatherDictionaryStatistics, ResolveInValidObjectSandensuresUfficientsPace.3. UpgradeSingdBuaormanStartIngInupgrademodeanDeannningCatctl.4.
Sep 04, 2025 am 12:29 AM
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