Linsert? ???? ?? ???? ??? ??? ???? ??? ??????
Linsert ??? Redis ???? ?? ?? ??? ??? ?? ???? ? ?????. ??? ??? ????. linsertkeybebefore | afterpivotValue. ?? ??, ?? MyList? ?? 1 ?? 1.5? ????? linsertmylistafter11.5 ??? ??????. "??"?? ????? ??? ???? ?? ?? ??? ??????. ?? : Pivot? ???? ??? ?? ?? ??? ???? ?? -1 ?? 0? ???? ????. ?? ????? ??? ?? ?? ?? ??????. ?? ??? ?? ??? ?? ? ? ????. ??? ???? ?? ?? ? LRANGE?? ? ?? ? ?? ??? ???????.
Sep 04, 2025 am 09:52 AM
MySQL?? ?? ??? ???? ??
?? ()? ?? ??? ??? ????, ?? ?? ??? ??? ??? ???? ???? ? ?????. 1. SelectNow ()? ?? ?? ?? ???? ?? ?? ?? select?? ?? ??? ? ????. 2. ????? ?? ??? ???? ???? ?? ??? ???? ?? DefaultNow () ??? ?????. 3. OnupDatenow ()? ?? ? ?????? ??? ???? ?????? ?????. 4. ?? ??? ???? ()? ?? ??? ??? ????, curdate ()? ??? ????, curtime ()? ??? ???? UTC_TIMESTAMP ()? UTC ??? ?????. ??? ??? ? ?? ??? datetime ?? timestamp?? ???? ?????.
Sep 04, 2025 am 08:51 AM
SQL? ?? ???? ?? ??? ??????
sqltransactionSolationLevelsControlHowTransActionSINGINGINTERCCESSINGSHARDERDATA, BALANCINGCONSENCY ? FormanceBypReventingDirtyReads, NonrepeatableReads ? PhantomReads.1.ReadUncomittAlsDirtyReads, Nonrepeatablereads, ? Maki
Sep 04, 2025 am 08:25 AM
MySQL?? ?? ?? ???? ???? ??? ??????
insertignoreInMysqLallowsInsertingRowsWhileStrowsIllentySkippingErrorslikingErorslikedupliceKeysorInvalidData, duplicates.1) useIttoInyifitdoes to notelakeifitdoes to notaledoxistbasedonUnunUniqueRprimaryConstrAnts.2) it
Sep 04, 2025 am 08:23 AM
MySQL?? ON ?? ? ???? ?? ??? ??????
theonduplicatekeyupdatestatementinmysqlallowsaninsertoperationtoupdateanexistingrowifaduplicatuprimarykeysfound, efficientupserts? ?? ? ????
Sep 04, 2025 am 08:21 AM
Redis vs ?????? : ????? ??? ? ?????
??? Redis? ???? ?? ?? ??????? ?? ?????. MySQL ?? PostgreSQL? ?? ?? ??????? ?? ? ??? ???? ??, Redis? ??/exec ??? ?? ??? ?? ??? ?????. ?? ??????? ??? ??? ???? ???? ???? ??, Redis? ????? ??? ? ??? ?? ??? ??? ?????. ??? ?? ?? ???? ??? ?? ???????. ?? ? ??? ??? ?? ?? ??????? ??????. ???? ???? ?? ???? ?? ? ? Redis? ? ?? ? ? ????.
Sep 04, 2025 am 08:11 AM
SQL? ????? ??? ??? ???? ??
tofindthepositionofacharacterorsubstringinastinsql, useposition () inpostgresql, charindex () insqlserver, inst () inmysqlandoracle, orlocate () inmysql, allof whichreturnthe1 ?? indexofthefirstocturnenceand0ifnot-with with syntaxandoptionalparameparemparemparemparemparemparemporing
Sep 04, 2025 am 08:05 AM
SQL?? ?? ???? ???? ??
excrectoperatorinsqlreturnsrowsfromstquery thatarenotpresentinthesecondquery, botheWothiestoHavetHeAmenumberOfcolumnswithCompatiBledAtAtypes, anditaUtomalityRemovestgrestgrestgrestgrestgrestgrestgrestgrestgrestrestgrestgrestgrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestrestr
Sep 04, 2025 am 07:42 AM
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
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