SQL?? ???? ???? ???? ??? ??????
?? ??? : CreateSchemaschema_name? ???? PostgreSQL ?? SQLServer?? ??? ????. MySQL??, CreateAbaseSchema_name? ??? ??? ?? ????. 2. ???? ???? ????. createTableschema_name.table_name? ???? CreateTableMarketing.campaigns? ?? ??? ??? ?????. 3. ?? ??? ?????? : PostgreSQL?? SetSearch_PathTomarketing ? Public? ???? ??? ?? ??? ?? ??? ??????.
Sep 02, 2025 am 07:59 AM
MySQL?? ?? ???? ?? ? ??? ?? ??
inanadjacencyListModel, LeaMnodesArefoundUsingAnteAteFoundUsingAlfeTeAteFoundEfoundeAntifynodeswithOutChildren : selectT1.id, t1.namefromtreet1leftjointreet2ont1.id = t2.parent_idwheret2.parent_idisnull; 2. inanestedsearedifiendifiedwherergt 1 : LeaMnodeRergt
Sep 02, 2025 am 07:51 AM
SQL?? ??? ?? ?? ??? ???? ??
TopreventDatAtyPeConversionErrorsInsql, useaFeConversionFunctionSliketry_cast (), try_convert (), orconditionAllogicWithValidationCheckStoretUretNullInsteAdOferrors; validataTataFormatsBeforeConversionUsingRegexorBuilt-infunctions;
Sep 02, 2025 am 07:50 AM
MySQL? CSV ???? ???? ???? ???? ??? ??????
toExportDatatoAcsv, useElect ... intooutFileWithProperPath, ?? ? ?? ?? ?, theqlUserHasfilePivilegeNTHERSERVERCANWRITETETESPECIFIEDLOCATION;
Sep 02, 2025 am 06:47 AM
MySQL?? ????? ?? ? ID? ?? ??? ??????
tofindthelastinsertedidinmysql, usethelast_insert_id () functionimmed bestimeftertheinsertstatement; 1.itreturnstheauto-gendecentinsertinthecurrentsest; 2. itissessions- ?? ?, ensuringsefetyinmulti-userenvonderments; 3. itpersistsilan
Sep 02, 2025 am 06:12 AM
MongoDB ??? ??? ??? ??? ???? ? ? ?????
MongoDB? ?? ? ??? ?????? ??? ?? ??? ????? ??? ????? ???? ? ????. ?? CPU ??, ??? ??, ??? I/O ? ???? ???? ??? ??? ??????? ?????? ??, HTOP, IOSTAT ?? PROMETHEUS GRAFANA? ???? ?????????. ??, db.currentop (), db.serverstatus (), db.collection.stats () ? rs.status ()? ?? MongoDB? ??? ???? ?????? ??? ??? ??????. ?? ?? Mongodbatlas, Prometheus Mongodbexporter ?? ?? ?? ???? ??? ??????.
Sep 02, 2025 am 06:06 AM
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?? ??? ????? ????? ?? ??? ?? ? ????. 1. Winrar ?? TAR ??? ?? ?? ??? ???? ?? ???????. 2. ? ??? ?? ??? ??? ???? ????? ???? ??? ???? ??? ??????. 3. dump.sql ?? config.php? ?? ?? ??? ???? ??? ?? ??? ???? ??? ??? ?????. 4. ?? ??? ?? Winmerge, KDIFF3 ?? RSYNC? ?? ?? ??? ???? ?? ??? ????? ??? ??? ??????.
Sep 02, 2025 am 05:52 AM
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?? ??? ??? ? ??????? ??? ?? ???? ?? ? ? ????. 1. 1. ??? ???? ?? ??, ?? ?? ?? ?? ? ?? ??? ??? ?? ????? ?? ? IDE? ?? ??? ??????. 2. Tabnine, Githubcopilot ? Prettier Intellisense ????? ??? ?? ??? ????? ?? ????/??? ???? ?? ???? ?????. 3. ? ??? ??? ???? ???? ????? ????? ???? ?? ? ??? ???? ??? ??? ??????. ??? ??? ????? ??????? ?? ??? ????? ? ???? ???? ?? ?? ??? ? ? ?????.
Sep 02, 2025 am 05:11 AM
MySQL ???? ???? ???? ??? ??????
insertinto ?? ???? MySQL ???? ???? ??????. ?? ??? insertIntotable_name (column1, column2, ...) ? (value1, value2, ...)???. ?? ?, ?? ?? ????? ?? ??? ?? ???? ???? ?? ? ? ????. ?? ??, insertIntousers (??, ???, ??) ? ( 'johndoe', 'john@example.com', 30)? ?? ???? ????? insertIntousers (??, ???, ??) ? (...), (..
Sep 02, 2025 am 04:04 AM
MySQL?? ??? ???? ??
MySQL?? ??? ????? DropFunction ?? ??????. 1. ?? ??? ????? : dropfunctionFunction_name; 2. ????? ?????? ?? ?? ifexists : dropfunctionifexists function_name; 3. Alterroutine ??? ??? ??????. 4. ?? ?? ???? ??? ??????. 5. information_schema.routines? ???? ?? ??? ? ? ????. ?? ??? ??? ??? ??? ??? ???????.
Sep 02, 2025 am 03:54 AM
SQL?? N ??? ?? ??? ?? ??? ??????
UselimitOffSetWithDistInmySinMysIcl/postgresql, uselimitOffSetWithDeAtRearsinMySkl/postgresql, hefturetareArdledByskippingn-1RowsNDETHENTHENXTUNIQUESALARY.2.AppLYROW_NUMBER () InMODERNSQLDATABASES whenStrictrownumberingIseeded, butnoteStong antOntsontOntOdUtoDuploTeNneediede
Sep 02, 2025 am 03:10 AM
??? SQL? ???? ???? ??? ??????
??? ???? ????? ?????? ???? ?? ??? ??? ???????. 1. ANSISQL ??? ???? PostgreSQL, SQLSERVER, SQLSERVER, SQLSERVER, SQLSERVER, SQLITE ?? ??? SELECTCAST (123ASVARCHAR (10))? ?? CAST () ?? ??; 2. SQLSERVER ? MYSQL? ?? ???? SelectConvert (Varchar (10), 123)? ?? Convert () ?? ??? ?? ??? ????? ??? ???????? ????. 3. ?????? ? ???? Oracle? To_cha? ?????
Sep 02, 2025 am 03:02 AM
MySQL? substring_index () ??? ??????
substring_index () substring_index () ExtractSasubStringfromastringbasedOnadelimiterandoccurneccount, returningThepecificificifiedNumberfdelimiterOccentsHeWhencountispositiveAndafter, andurlsinmmsqld
Sep 02, 2025 am 02:50 AM
SQL?? ?? ??? ???? ??
ANINNERJOINERTURNSONLYROWSWITHMATCHINGVALUSINBOTHTABLESINBOTHTABLESINBOTHTABLES; 1) ?? eLectTopCifyDesiredColumns; 2) ?? in usefortheFirstTable; 3) ?? ??? ???? ?????
Sep 02, 2025 am 02:39 AM
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