Oracle

Common character sets and solutions for Oracle character setsOne. View the character set:1. Query the service-side character set:Select Userenv (' language ') from dualOrSELECT * FROM Nls_database_parameters2. Query the client:SELECT * FROM

OLE DB mode operations Oracle DatabaseA. Query statement:using(OleDbConnection conn =NewOleDbConnection (system.configuration.configurationmanager.connectionstrings["LOCAL_ORCL"]. ConnectionString)) {Conn. Open (); using(OleDbCommand

Note: Questions and Answers are from the Internet. This article only provides answers for users to learn! Question: Answer: This topic describes the usage of merge. The concepts are as follows: The merge statement is a new syntax of Oracle9i,

1. ASCII: returns the decimal number corresponding to the specified character;SQL> select ASCII ('A') A, ASCII ('A') A, ASCII (0) zero, ASCII ('') space from dual;A A zero space------------------------------------65 97 48 2. CHR: returns an integer

[/Color] [color = Green] Table A records as follows:Aid anum1 A112 A223 A334 A445 A55 Table B records the following:Bid bname1 B112 B223 B334 b448 b88 The SQL statements for creating these two tables are as follows:Create TableAid int (1)

Export (import)% ORACLE_HOME %/db_1/bin/exp.exe(imp.exe)You can configure the environment variable path and then directly use the exp command. Bytes ------------------------------------------------------------------------------------------- · Export:

1! (The following mainly uses Oracle8i and DB2 7.x ). 1. How to obtain the explain method of Oracle and DB2 In the first N records of a tableOracle can achieve this ﹕Select * from user. bsempms where rownum DB2 can achieve this ﹕Select * From

1. Background In the project, BLOB fields are used to store packets. Recently, some customers need to use the DB2 database to deploy applications. All users have to import the Oracle initialization script to DB2 and create the DB2 initialization

Export Write commands directly in the command line 1. Export your own table Exp userid = Scott/tiger @ myoral tables = (EMP, Dept) file = D: \ e1.dmp   2. Export tables of other schemes. If you want to export tables of other schemes, you need DBA or

This section describes the structure and key functions of the Oracle ADF framework, and highlights the typical process of developing Web applications using Oracle ADF, EJB, Oracle toplink, and jsf in the jdeveloper 10g ide tool.   1Introduction to

Solution to Oracle tnsping failure after firewall is enabled on Windows 2008 1. solution:Simply put, the Windows 1521 firewall has blocked the Oracle port. Just create and enable it. Of course, if your listener is another port, open the other ports

Install Oracle 10 gwindows in Windows 7 , Oracle I liked it.WindowIt was really good. After a few days of running-in, I felt quite good. I started to install the required software.Of course, the Oracle client is needed.The version is 10

Brief Introduction to Oracle TNS  What is TNS? TNS is a part of Oracle Net. It is a tool used to manage and configure the connection between the Oracle database and the client. In most cases, to communicate with the database, TNS must be

Starting to test Oracle 11g RAC, the current performance is limited, so a single node RAC is installed. The procedure is as follows: Nic binding Modify ifcfg-bond * ifcfg-eth * in/etc/modprobe. conf and/etc/sysconfig/network-scripts * I will not

  An Introduction to materialized views: Http://blog.csdn.net/tianlesoftware/article/details/4713553   On Lao Yang's blog, I saw some column descriptions, sorted them out, and reproduced them. The original Article link is as follows:   Rapid refresh

  Operating System: win7 64-bit ORACLE: 11gr2 32-bit   However, the following errors occur continuously in the Alert Log: Mon Feb 06 14:38:22 2012 Oer7451 in load indicator: Error code = OSD-04500: Illegal option specified O/s-error: (OS 1) function

Database operations are an essential part of system development at present, especially in the big data era. But do you really know how Java connects to databases? Let's give you a simple example of database connection: Package COM. java. dbtest;

Common Oracle function summary ************************************************************ **************************************** SQL group functions (Num can be a column or expression )*(Null values are ignored, default between distinct and all

  In Oracle, you can use the instr function to determine whether a string contains specified characters. Its syntax is:Instr (string, substring, position, occurrence)Where String: indicates the source string; Substring: The substring to be searched

Source Description: This post, the original web site http://www.cnblogs.com/leup/archive/2007/11/18/962952.html Reason for posting: The Oracle Auto-increment field is different from the SQL field, but the call is very interesting. Multiple users