Oracle

Remove line breaksUpdate zhzl_address t set t. add_administration_num = replace (t. add_administration_num, chr (10 ),''); Remove carriage returnUpdate zhzl_address t set t. add_administration_num = replace (t. add_administration_num, chr (13 ),'');

The Oracle DECODE function is very powerful. The following describes the usage of the Oracle DECODE function in detail. We hope you can learn more about the Oracle DECODE function. Oracle DECODE Function Oracle DECODE function is an exclusive

Copy codeThe Code is as follows: using System; Using System. Collections; Using System. Collections. Specialized; Using System. Data; Using System. Data. OracleClient; Using System. Configuration; Using System. Data. Common; Using System.

The ORACLE tutorial is as follows: After Oracle 8x is automatically disconnected, connect again. In actual database applications, we often encounter such a problem. After an operation is performed, the user connected to the Oracle database will no

The ORACLE tutorial is: Implementing a dynamic Web database using the Oracle component. [Abstract] This article briefly introduces the basic methods for implementing Web databases, and discusses the basic methods for implementing dynamic Web by

This course is a part of the Oracle Advanced Course, which is slightly theoretical, but closely related to database program development, management, and optimization. In addition, part of this course has been covered in the previous chapter, pay

I accidentally heard about the snapshot of the oracle database. I was stunned when I first heard it. I didn't know what it was, and I spent some time studying it, the following is my summary on network learning. Snapshots are mainly used in

Requirements:You need to find that a customer has continuously handled the business for those days of a year.The SQL implementation is as follows::Create a table:Copy codeThe Code is as follows:Create table test_num(Tyear number,Tdate ); Test

I. Solution to garbled buttons in oracle em:1. Modify the font of jdk.Copy codeThe Code is as follows:[Oracle @ esop db_1] $ cd $ ORACLE_HOME/jdk/jre/lib/[Oracle @ esop lib] $ mv font. properties font. properties_bak[Oracle @ esop lib] $ cp font.

During the development process, you may often encounter some tests. At this time, you may want to understand the testing process and analyze the code Errors Based on the process. In this case, you need to use custom exceptions. For more information,

After installing oracle in the notebook, you can use the OEM console normally. However, after logging out, log on again or restart the system, or change the network environment of the notebook, problems may occur. The solutions to these problems

Typical problems are: Sometimes, it indicates that an index is created, but the query process obviously does not use the relevant index. As a result, the query process takes a long time and consumes a large amount of resources. What is the problem?

1. What is an execution plan) Execution Plan: the execution process or access path of a query statement in ORACLE.Ii. How to view the execution plan1: Press F5 under PL/SQL to view the execution plan. Third-party tools such as toad.Many people think

Implemented in languagesBenefits:1. reduce access to the database.2. Good portability.Disadvantages:1. There are many things to consider in operations. To modify one place, you must modify the other. That is, they are interrelated. If a change is

The first case is that the returned cursor is the data of a specific table or view, for example:SQL-Code:Copy codeThe Code is as follows:Create or replace procedure P_TESTA (Presult out SYS_REFCURSOR)ASBEGINOpen presult for select * from users;END P_

(1) OracleServiceSID Database Service, which automatically starts and stops the database. If a database is installed, its default start type is automatic. The service process is ORACLE. EXE, the parameter file initSID. ora, the log file SIDALRT. log,

Delete deletes a large table. It is not released between time and space. It is very slow because it occupies a large amount of system resources and supports rollback. The space is also occupied by this table.Truncate table Name (tablespace is

If you use the Order BY sorting statement to specify the Order BY employee number, all records generated after sorting are temporary data. How does the Oracle database process the temporary data?Generally, the Oracle database first stores the

If the view definition includes conditions (such as the WHERE clause) and its intention is to ensure that the WHERE clause is applied to any INSERT or UPDATE statements that reference the view, you must use with check option to define the view. This

Data Guard provides two services:1) Redo transmission service: Transfers Redo logs of Primay to one or more Standby destinations.2) Redo Application Service: The Redo log transmitted from Primay on the Standby side.This article describes the Redo