SQL? ????? ?? ? ?? ??? ??? ??? ??????
???? ?? ? ? ??? ???? trim () ??? ???????. 1. Trim ( 'Helloworld')? ???? ??? ? ??? ???? ??? 'HelloWorld'???. 2. ? ?? ?? ? ???? MySQL ? SQLServer? ltrim ()? ???? Trim (LeadingFrom)? ??????. ?? ?? ? ???? rtrim () ?? ?? (Trailingfrom)? ??????. 3. ??? ? X? ???? ?? Trim ( 'xxxhelloworldxxx')? ?? ??? ??? ?? ??? ??? 'Helloworld'???. ? ??????
Aug 11, 2025 pm 03:11 PM
SQL?? ?? ? ???? ??? ???? ??? ??????
sqlserver? string_split ??? ???? ?? ? ???? ??? ???? ?? ? ??? ???? ? ??? ???? ??? ?? ??? ???????. 2. PostgreSQL? String_to_array? Unnest? ???? ???? ??? ????? ???? ?????. 3. MySQL? ?? ?? ??? ???, ? ??? ?? CTE ?? ?? ??? ? substring_index? ?? ? ? ????. 4. Oracle? regexp_substr? ???? ?? ???? ??? ? ??? ?? ??? ?? ?????. 5. SQLITE?? ?? ??? ??? ??? ?? CTE? ??? ???????.
Aug 11, 2025 pm 02:36 PM
SQL?? ??? ??? ??? ??
astoredProcedureIsAreSaBlesiblesCodeBlocktCancceptArametersandExecuteCplexLogic; 2.TocreateOne, usecreateprocedurefollowed bytheprocedurename, ?? ?? ? SQLStatementswithinabegin-endblock; 3.syntaxvariesslightlybydatabase : sqlserverusesexecanddecl
Aug 11, 2025 pm 02:22 PM
?? ?? ??? ???? ?? ?? ??? ??? ??????
geospatialindexesarespecializeddatabasestructuresdesignedtoefficileditymanageandquerymulti-dimensionalspatialdata.unlikeregularindexes
Aug 11, 2025 pm 01:39 PM
MySQL???? ?? ?? ??
mysqldoesnothavebuilt-inrow-levelsecurity, butitcanbeimplementedusingviews, storedProcedures, andaccessControl.1.UseViewStofilterrowsBasedOnTheCurrentUserByLeveragingFunctionslikeCurrent_User () andAmpingTableTorStrictDAtAvisibitied.2
Aug 11, 2025 pm 01:33 PM
SQL?? ?? ??? ??? ???? ??? ??????
MySQL? modifyColumn? ???? ?? ??? ?? ???????. 2. PostgreSQL? AlterColumnType? ???? ???? ???? ??????. 3. SQLServer? AlterColumn? ???? ?? ??? ??? ??? ? ????. 4. SQLITE? ??? ?? ??? ???? ??? ???? ???????. ??? ??? ?? ??? ??? ?? ?? ?? ?? ??? ???? ???? ???? ???? ???? ???????.
Aug 11, 2025 pm 01:02 PM
SQL?? ?? ??? (Regex)?? ??? ???? ??? ??????
mysql ? mariadb? wherecolumn_nameergexp '^a'? ?? ??? ? ??? regexp ?? r ?? ???? ?????. 2. PostgreSQL? ~ (CASE ???) ? ~* (???) ???? ???? WHERECOLUMN_NAME ~ '^\ D {3}-\ d {3}-\ d {4} $'? ?? ?? posix ??? ?????. 3. Oracle? MySQL8.0 ?? ??? ???? ?? whereeregexp_like (column_name, '^john', 'i')? ?? regexp_like ??? ?????. 4. SQLITE? ????? ????? ???? ???
Aug 11, 2025 pm 12:47 PM
SQL????? ??? ??
??? ????? ??? createViewView_NameAsselect ????. 2. ?? ?? ???? ???? ??? ?? ???? ??? ?? ??? ???????. 3. kreateorreplaceview? ??????? ??? ? ????. 4. ?? DropView? ?? ?? ? ? ????. 5. ?? ??? ??? ?????, ??? ??? ??? ????, ????? ???? ???? ? ????? ??? ?????? ?????? ????? ??? ???? ????.
Aug 11, 2025 pm 12:40 PM
MySQL? ??? ?? ? ?? ???? ???? ??
MySQL? ? ???? ???? ????? ??, ??? ?? ? ?? ?? ?? ??? ???????. 1. ??? ??? ??? ?? information _schema.columns? ???? Unionall ? ?? ??? ?? ??? ????? ???? ?? ?????. 2. ??? ???? ??? ?, ?? ??? ???? ISNULL ??? ???? ? 1 ?? ? 2?? ???? ?? ?? UnionAll? ???? ??? UnionAll? ??????. 3. ?? ??? ?? ?? ?? ???? ??? ? ??? ???? ? ???? ???? NULL SAFE ?? ???? ???? ? ?? ?? ??? ??????. 4. ?? ? ??? ?? ??? ???? Count (*)? ?? ??? ? ????.
Aug 11, 2025 pm 12:14 PM
?? ? ??? '??'? ??????
thescoreinaredissortedsetisanumericalvaluetheMinesteMinesteMinesteTesteset.unlikereGularSets, thateUnordered, sortedSessUsCorestomainAnaUtomAromErfromsMallestTollest.EachmemberiasiatedWithascore, Enbingdymamicrankingand
Aug 11, 2025 am 11:55 AM
SQL?? ??? ?? ?? ??? ?? ??? ??????
insqlserver, usescope_identity () togetThelastIntitedIntityValueWithInthesmescope, 2.inmysql, uselast_insert_id () reamepterIntert, 3.inpostgresql, usetheretherningclationsta
Aug 11, 2025 am 11:50 AM
SQL?? ??? ???? ???? ?? ??? ??? ??????
Like ???? ???? SQL?? ?? ??? ??????. 1.% ??? ??? 'a%'? ?? ?? ??? ???? a? ???? ???? ????. 2. _wildcards? '_a%'? ?? ?? ??? ???? ? ?? ?? a? ?? ???? ????. 3. 'j__n%'? ?? ??? ??? ???? j? ???? ???? ? ?? ?? n? ?? ? ????. 4. ?? ??????? ?? ???? ?????????. MySQL ? SqlServer? ????? ??? ???? ??? PostgreSQL? ?? ? ??? ?? ???? ?? ????, Ilike? ?? ? ??? ?? ???????. 5. Escape Keyword? ???? '\ %'? ?? ?? ??? ???? ???? ??? ??? ???? ??? ???? '\ _'? % ?? %? ???? ?? ? ??? '\ _'
Aug 11, 2025 am 11:48 AM
Python? ?? Mongodb? ?????
Pymongo ?? : PipinstallPymongo? ???? ????? ??????. 2. ?? ???? ?? : Mongoclient ( 'mongodb : // localhost : 27017/')? ?? ???? ?? URI? ?? ???????. 3. Mongodbatlas? ?????? : Mongodb srv : // user : pass@cluster.host/dbname? ?? ??? ??, ?? ? ???? URL? ?? ? SRV ?? ???? ??????. 4. ?? ?? : ?? ??? ?? ?????? ???? ??????? ???? ?? ??? ?????. 5. CRUD ?? ?? : Insert_One? ??????
Aug 11, 2025 am 11:32 AM
? ??? ??? ???? ?? MySQL ???
TOUSEMYSQLEFICLEASAMESSAGEQUEUNDERHIGH-THROUGHPUTWORKLOADS : 1) useInNodbbitHproperIndexing —CreateCompositeIndeSeldeSeldsIndsikeVequeue_nameAndStatus, avoidexciessiveDexestomainInsertperformance.2) a usebatchoperations —inse
Aug 11, 2025 am 11:26 AM
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