Oracle

How to find similar records in the database [problem] There are a large number of duplicated data entries in the business system due to preliminary design reasons, and the names of repeated entries need to be removed now.However, these names are

Use left join instead of not in or not exists SQL code www.2cto.com and use left join. As a result, the value of TempColum in the testb table is NULL: SQL> SELECT. *, B. id "TempColum" FROM testa a left join testb B ON. id = B. id; id value

On Solaris, when Oracle 10g Database is started automatically, the following prompt is displayed: www.2cto.com ORACLE_HOME_LISTNER is not SET, unable to auto-start Oracle Net ListenerUsage: /export/home/oracle/product/10gr2/bin/dbstart ORACLE_HOME

1. Cold backup copies all database files to another directory when the database is closed. Here, you can perform some operations on the database (such as creating a table and inserting corresponding values into it, mainly to achieve the effect after

In oracle, jobs are used to periodically execute Task 1. view the jobselect job in the oracle database, what from user_jobs; 2. delete jobexecute dbms_job.remove (jobID) in oracle. Note: jobID is the job value queried in "select job, what from

What is dual in oracle? What is dual? A: www.2cto.com dual is a system table and cannot be deleted or modified. Its name is "pseudo table" or "dumb table ". Check its table structure: is the name of SQL> desc dual empty? Type ----------- -------- ---

Create or replace function hello www.2cto.com /**************************** * ***************************** Author: fuqiang WX155924 Version: v1.00 Date: 2013-01-06 Description: move a directory ************************************* * ***************

After the server is replaced with the hard disk, Oracle can be started normally after the Oracle cannot be connected. However, the Listner cannot be started, so applications and clients cannot connect to the database. After some searching and

PL/SQL script language loop for while usage learning example (1), loop learning (a), loop www.2cto.com declare -- sum variable I variable 1 .. 100 v_sum number (5); v_ I number (5); begin v_sum: = 0; v_ I: = 1; loop v_sum: = v_sum + v_ I; v_ I: = v_

Description: Environment: oracle10.2.0.5 RAC + HP-UX use the analyze index validate structure statement to verify the degree of fragmentation of the index, then, we can query through the index_stats view. How much impact does this statement have on

Summary of oracle thin client and plsql installation problem installation environment: After the oracle thin client is installed on win7 www.2cto.com, problems encountered during plsql login: Access violation at adress 614A2909 in module 'oran9. dll

Oracle Listener static configuration, dynamic registration, and LOCAL_LISTENER question 1.1. oracleListener static service configuration and dynamic service registration 1.1.1 what is service registration first some basic concepts: Oracle instance,

How many Oracle Database startup methods do you know? There are four answers. there are four Oracle Database startup methods. Please refer to the first one: startup nomount non-installation startup: This method can be executed under startup:

A connect by prior... start with nonsense test code. www.2cto.com Java code create table test_table_c (id number primary key, description varchar (255 ),Parent_id number); insert into test_table_c (id, description, parent_id) values (1, 'cuiyaonan2',

Create an ASM With Oracle 10G. Since the subsequent demonstration operations will use the ASM instance, create a simple ASM instance at the beginning of the article, and then introduce the ASM in detail. The specific procedure for creating an ASM

In PL/SQL, the problem of "ORA-06533: the number of tables in the following Table exceeded" is solved. VARRAY is a type introduced at Oracle8G and is a dense filling array, it is easier to be understood as a traditional array. When creating these

Common tables for Oracle testing: create tables for test using BIG_TABLE, which is often used by DBAs. Generally, many tables are created based on dba_objects. This article is based on the big_table of Master Tom for your reference. Www.2cto.com 1.

SQL optimization series (2) _ SQL optimization sorting 1. SQL query optimization (1 ). table name order (only valid in rule-based Optimizer): The Parser for www.2cto.com ORACLE processes the table names in the FROM clause in the order FROM right to

Data Guard Standby_archive_dest and Log_archive_dest_n: www.2cto.com STANDBY_ARCHIVE_DEST is relevant only for a standby database in managed recovery mode. it specifies the location of archive logs arriving from a primary database indicates the

Control File restoration scenario 1: rebuilding control File www.2cto.com • You 've experienced a failure and lost all of your control files, and youBelatedly realizethat you don't have a good binary backup of the control file. • You want to change