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Technical Articles

Database

Oracle

How to generate a random number in Oracle?

Oracle's DBMS_RANDOM.VALUE function is used to generate random numbers, which can return floating point numbers between 0 and 1 or values ??within a specified range. For example, SELECTDBMS_RANDOM.VALUE(1,100) generates random numbers between 1 and 100; random integers can be obtained through functions such as ROUND, FLOOR, etc.; supports manual set of seeds to achieve repeatable results, which is suitable for testing scenarios.

Sep 16, 2025 am 02:22 AM

oracle random number

How to connect to an Oracle database?

To connect to an Oracle database, you need to prepare client tools, connection information, and authentication credentials. When using the SQL*Plus command line tool, execute sqlplususername/password@//hostname:port/service_name, such as sqlplusscott/tiger@//localhost:1521/ORCL; if using a programming language, Python can configure DSN and connect through cx_Oracle makesn, and Java uses JDBC driver to load jdbc:oracle:thin:@//hostname:1521/ORCL format URL; graphics

Sep 15, 2025 am 02:40 AM

oracle Connect to the database

What is Oracle Data Pump?

OracleDataPumpisahigh-speed,server-basedutilityforefficientdataandmetadatatransferbetweenOracledatabasesorfiles,replacingolderEXP/IMPtools.Itincludesexpdpandimpdpcommand-linetoolsforexportingandimportingdata,andDBMS_DATAPUMPandDBMS_METADATAPL/SQLAPIs

Sep 15, 2025 am 02:11 AM

數(shù)據(jù)泵

What is the purpose of an Oracle trigger?

Oracle triggers are stored procedures that are automatically executed when database events occur. They are mainly used to maintain data integrity, implement business rules and automate operations. 2. They ensure that the data is accurate and consistent by verifying or modifying it, setting default values, preventing invalid inputs, and enhancing reference integrity. 3. Triggers are often used for auditing, recording the time, operators, and new and old values ??of data change, and saving them in the log table. 4. Complex business logic can be implemented, such as role-restricted operations, trigger notifications, or synchronized multi-table data. 5. Overall, triggers respond to database events in the background to improve automation and control capabilities.

Sep 14, 2025 am 01:35 AM

database trigger

How to use the PIVOT clause in Oracle?

PIVOTinOracletransformsrowsintocolumnsforcross-tabularreports.Itrequiresasubquery,anaggregatefunctionlikeSUM,andspecifiedvaluesintheINclausetopivoton,enablingefficientdatasummarizationinwideformat.

Sep 13, 2025 am 03:19 AM

How to lock a user account in Oracle?

To lock the Oracle user account, use the ALTERUSER command and add the ACCOUNTLOCK clause, such as ALTERUSERscottACCOUNTLOCK; the user will not be able to log in after execution. You can confirm that the status is LOCKED by querying the DBA_USERS view. When unlocking, use the ALTERUSERusernameACCOUNTUNLOCK command to resume access.

Sep 13, 2025 am 02:12 AM

oracle User lock

How to create a primary key in Oracle?

CreateprimarykeyduringtablecreationusingPRIMARYKEYconstraint,whichenforcesuniquenessandNOTNULL;2.Definecompositeprimarykeyattablelevelformultiplecolumns;3.AddprimarykeytoexistingtableviaALTERTABLEwithCONSTRAINT;4.Nametheconstraintforeasiermanagement.

Sep 12, 2025 am 03:34 AM

How to create a database link in Oracle

AdatabaselinkinOracleiscreatedtoaccessremotedatabaseobjectsbydefiningaconnectionpathusingnetworkdetailsandcredentials.2.Ensurenetworkconnectivity,properOracleNetconfiguration,aTNSorEasyConnectstring,andtheCREATEDATABASELINKprivilegebeforeproceeding.3

Sep 12, 2025 am 02:17 AM

What is an Oracle database link?

AdatabaselinkenablesaccesstoremoteOracledatabaseobjectsasiftheywerelocal.Itstoresconnectiondetailslikenetworkaddress,username,andpassword,allowingSQLqueriessuchasSELECT*FROMemployees@sales_dbtoexecuteontheremotedatabaseandreturnresults.Linkscanbepriv

Sep 11, 2025 pm 12:16 PM

oracle 數(shù)據(jù)庫(kù)鏈接

How to perform a LEFT JOIN in Oracle?

ALEFTJOINreturnsallrowsfromthelefttableandmatchedrowsfromtherighttable,withNULLsforunmatchedright-sidecolumns.InOracle,useLEFTJOINorLEFTOUTERJOINintheFROMclausewithproperONconditions.Forexample,joiningemployeesanddepartmentsensuresallemployeesappear,

Sep 11, 2025 am 10:35 AM

oracle

How to enable auditing in Oracle?

EnablestandardauditingbysettingAUDIT_TRAIL=DB,restartingthedatabase,andauditingspecificactionslikeSESSIONorSELECT;2.ForOracle12c ,useunifiedauditingbyenablingitviamakecommand,creatingauditpolicies,andqueryingUNIFIED_AUDIT_TRAILforlogs.

Sep 10, 2025 am 02:18 AM

oracle audit

How to add a column to an existing table in Oracle?

UseALTERTABLEwithADDtoaddacolumninOracle.Syntax:ALTERTABLEtable_nameADD(column_namedata_type[DEFAULTvalue][constraints]).ExamplesincludeaddingVARCHAR2,NUMBERwithdefault,NOTNULLDATE,ormultiplecolumns.Newcolumnsappearattheend,defaulttoNULLunlessspecifi

Sep 10, 2025 am 02:15 AM

oracle 添加列

What is an Oracle view and how to create it?

AviewinOracleisavirtualtablebasedonaSQLquery,usedtosimplifyqueries,enhancesecurity,andmaintainconsistency.Itdoesnotstoredataitself,exceptformaterializedviewswhichphysicallystoreresults.Tocreateaview,usetheCREATEVIEWstatementfollowedbyaSELECTquery.For

Sep 09, 2025 am 02:46 AM

Database view oracle view

What is Oracle RMAN and how to use it for backup?

RMANisOracle’sbackupandrecoverytoolthatenablesefficient,block-levelbackupswithminimalperformanceimpact.Itsupportsincrementalbackups,automatedoperations,andbothonlineandofflinebackups,whileintegratingwithdiskandtapestorage.Keystepsincludeconnectingvia

Sep 09, 2025 am 01:56 AM