Oracle

--Export Database Exp Test2/[email protected] file=e:\test2.dmp Owner=test2 --Import Database Imp test2/[email protected] file= ' e:\test.dmp ' fromuser=test touser=test2 --View Oracle's current number of connections

Character IP to numeric conversion:1 Create or Replace functionF_ip2number (v_ipinch varchar2)return Number is2I Number;3 begin4I=Regexp_substr (V_IP,'(\d{1,3})',1,1)*16777216 5 +Regexp_substr (V_IP,'(\d{1,3})',1,2)*655366 +Regexp_substr

PL/SQL has three types of exception errors1. Pre-defined errorsOracle has approximately 24 predefined exception errors that are not defined in the program and are automatically raised by Oracle.2. Non-predefined errorsOther standard Oracle errors

First step (Connect to Oracle):In the DOS interface (below is the DOS interface operation) input: Sqlplus sang/12345 (here User name and password to write casually) @orcl as SysdbaSecond step (create user and authorize):Create user user1 (user name)

Oraclewindow functions in supportrow_number (), its usage andMSSQLServer2005in the same way as weperform the followingSQLstatement:SELECT * from(SELECTrow_number () over (ORDER byfsalaryDESC) Row_num,Fnumber,fname,fsalary,fage fromT_employee)

1. You cannot delete some rows directly in the view, because the view is a virtual table, and to delete rows of data in the view, it is equivalent to deleting the base table, so it can only be removed from the base table.2. Instead of triggers can

Oracle Statement Optimization 1Optimization is choosing the most efficient way to execute SQL statements. The Oracle Optimizer chooses what it deems most effectivemethod to execute the SQL statement.1. Is null and is not NULLIf a column has a null

Maven adds dependency issues for Oracle JDBC driversOracle's JDBC Driver jar package cannot be downloaded in the MAVEN project and requires Oracle's official authorization to To find a ojdbc14 10.2.0.1.0 or 10.2.0.2.0 package, let maven re-hit the

For the sake of convenience, the following simple models are established and some test data are constructed:In a business admissibility subsystem BSS,SQL Code --customer data sheet Create table customers ( customer_id

(1) Installation of dependent packagesInstalling Oracle under Linux, in addition to the system configuration parameters, I think the installation of dependent packages is another trivial operation.This installation has encountered several package

Disclaimer: This article is for bloggers in the project to use some of the common commands, do not reprint.Oracle Common Naming SummaryTo create a table space:--create tablespace VMS--datafile ' e:\vms.dbf '--size 32000M--extent Management local

Bitand () function in Oraclereturns the result of two numeric numeric values after a bitwise AND operation.GrammarBitand (NExpression1, NExpression2)ParametersNExpression1, NExpression2Specifies the two numeric values for the bitwise AND operation.

Configuring the Rman Backup EnvironmentFor most backup operations, Rman provides a reasonable default value for persistent parameter configurations, enabling you to perform basic backup and recovery. But if you know more about the configuration, you

Oracle Knowledge Point-jobOracle The job in crontab is similar to the role of a Linux-A to perform certain operations on a timedRelated views: dba_jobs,user_jobs,all_jobs,dba_jobs_runningRelated parameters:job_queue_processesRelated packages:

Recovery Manager (Rman) is a utility provided by Oracle that uses RMAN to back up, restore, restore, and so on to an Oracle database. This program does not need to be installed separately, and as part of the Oracle database, you have the Oracle

Sort common e functions, oracle Functions Recently I learned about Oracle databases and often encountered Oracle database functions. After careful consideration, I summarized some common Oracle database functions.   ----------------------------------

Oracle10g does not support the continue Solution The solution is as follows:: Jump using goto DECLARE done BOOLEAN; begin for I IN 1 .. 50 LOOP IF done THEN GOTO end_loop; END IF; > -- Not allowed unless an executable statement follows NULL; -

ORA-16014 and ORA-00312 Scenario: SQL> alter system archive log current;Alter system archive log current*Row 3 has an error:ORA-16014: log 2 sequence #34 Unarchived, no available destinationORA-00312: Online log 2 thread 1: '+ DATA_DG/orcl/onlinelog/

How to ignore the title of the first row in an oracle External table  Introduction When an oracle External table references a csv or other txt file, you often want to skip the title of the first line. In fact, when creating an oracle External

How to Create a database and a user in oracle Mysql and SQL server are widely used in the project development process, while oracle is rarely used. mysql and SQL server are similar in use, mysql and sqlserver can directly create a database by using