Oracle

The most common way to merge column values is to write a custom function to do this, and here's another way. You can use the for XML Path in SQL Server to merge column values, and you can use Wm_concat or Listagg in Oracle. Prepare data:

1, Ora-12541:tns: No listener Cause: The listener is not started or the listener is corrupted. If the former, use the command net start Oracleorahome10gtnslistener (the name may differ), and if it is the latter, use the "Net Configuration Assistant"

Oracle unlocks the Scott/tiger user 1, verify the current system for Scott user status: SELECT * from Dba_users where upper (username) = ' SCOTT '; Account_status:expired & LOCKED 2. Release the lock for Scott User: Conn Sys/bitservice@ttonline

Oracle Primary Data types Overview: The data types supported by various databases are similar, and may differ slightly from the data types in standard SQL languages Type: VARCHAR2: You can set its length limit when declaring a field. And after

There are two types of incremental backups in Rman: Differential and cumulative, and the levels of backups are divided into 0, 1, 2, 3, 4, 5 levels, with the highest level of 0. Differential backup differential (for superior and even peer backups

When the index is too fragmented, it affects the speed at which the query is executed, which affects our productivity. The most advantageous measure at this time is to rebuild the index. This article mainly introduces the process of examining index

Workaround: 1. View which profile strategy the user uses Sql> select Username,profile from Dba_users; USERNAME profile ------------------ ----------------- Mgmt_view DEFAULT SYS DEFAULT SYSTEM DEFAULT Ekpuser DEFAULT 2. View effective days

1, UPDATE nowait Apply the following scenario: Query a data and open database transactions to it. If the current data for the query is not locked, the result is returned correctly and the current data is locked, if the current data for the query is

[Oracle@zhongwc1 ~]$ Sqlplus/as SYSDBA Sql*plus:release 11.2.0.3.0 Production on Wed 23 17:02:01 2013 Copyright (c) 1982, Oracle. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition release 11.2.0.3.0-64bit Production With

1. Open the corresponding database through Plsql. 2. Select the Export Users Objects submenu under the menu tools 3. Select the table name that you want to export the table to, and then select the saved path. 4. Click the Export button to export

This article is a detailed analysis of the difference between MySQL and Oracle update, the need for friends under the reference Update: Tanku Updates Needless to say, the two are the same, mainly talking about the update of multiple tables Copy

The latest to do a connection to Oracle code, to match the environment variable: classpath=.; E:j2sdk14lib Ools.jar; E:oracleora90jdbclibclasses12.zip The tested computer is already installed with Oracle clients and can be connected with sqlplus. /

Get ready: Confirm objects and statements can be standby supported Make sure that the rows of the tables in the primary library can be uniquely identified Environment: Operating system: RED HAT LINUX ENTERPRISE 5 oracle:11.2.0.1.0 PRIMARY: ip:

Decode function: It can compare an input value to a parameter list in a function, and return a corresponding value based on the input value. The parameter list of a function is a number of sequential pairs of numbers and their corresponding result

A few days ago encountered a problem about Oracle is not equal to the last search for a moment, found the following information, to share with you, need friends can refer to the next is not equal to the number in Oracle: in Oracle, <> != ~=

We may have encountered in peacetime work, multiple table cascade Update, I also saw a lot of methods on the Internet, but the use of these methods generally did not succeed, so today I introduce you to a slightly troublesome method, the need for

  This article mainly introduces Oracle and MySQL 9 point difference, need friends can refer to the following 1. Group function usage rules MySQL group functions can be used at will in a SELECT statement, but in Oracle if there are group

System environment: Red Hat Enterprise Linux Server release 5.5 (Tikanga) Oracle Database 11g Enterprise Edition release 11.2.0.1.0 The steps are as follows: 1. Stop all Oracle Processes $ sqlplus/as SYSDBA For ASM Instance $ sqlplus/as

Oh, spent one hours, around the 11g installation toss good. It took a long time to toss the SQL Developer, and finally it was done. OK, first summarize the installation steps, hope to the rear of the children's shoes to improve the installation

To export script content: @echo off Rem REM File name Daily.bat REM Batch Process Reload DB Backup Rem REM Author Frank.fan REM modification History Created 2012-05-07 REM Modified Rem for/f "Tokens=1-3 delims=/"%%i in (' date/t ') do