Oracle

First, set operation1.UNION : the set operation. Syntax structure:sql>Select Table 1, column 1, table 1, column 2 from table 1 Union select Table 2 column 1, table 2, column 2 from table 2;Table 1, column 1 and table 1, column 2 is the two columns

The differences between Oracle DBA and SYSDBA are as follows:1. A DBA is a role that corresponds to the set of operations permissions on an object in an Oracle instance, and SYSDBA is a conceptual role that is a sign-in authentication identity.

The format of a general SELECT statement is as follows:1. Querying all columns of a specified tableSELECT * from Table name [ where condition ] [group by Group column name ] [ having aggregate function ] [ORDER BY Sort Column name asc|

The previous article writes, installs the centos6.5 on the virtual machine, the result according to the article very smoothly installs, but uses the Yum installs the software, the error, the source has the question, cannot download, then pings the

One.DescriptionSome of the table data in the OLTP library is large and there is a constant amount of data added every month. Because historical data is not visited in this library, it is analyzed in 1 other OLAP libraries. Therefore, the historical

Content from: Oracle®database SQL Language Reference 11g Release 2 (11.2) e41084-03.Empolyees table from the HR scheme, warehouses from the OE scheme. If your table contains hierarchical data, you can use hierarchical query clauses to select

Oracle servers are primarily made up of instances, databases, program global, foreground processesExample: used to provide the ability to administer a databaseDatabase: Consists of an Oracle database file that is used to store system data, typically:

Environment: Role Machine name Operating system Ip Note Main Library Db1 CentOS 5.11 x86_64 192.168.2.241 Install Oracle, create a database Standby Library Db2

1, dual-Machine Hot Preparation OverviewDual-machine heat with two implementation modes, one is based on shared storage devices, the other is not shared storage devices, generally referred to as pure software mode.Dual-Machine hot standby based on

The environment is as follows: #注意是SLES1 cat /etc/suse-2 (x86_64)341 5 6 7 Linux.x64_11gr2_database_1of2. Zip 8 Linux.x64_11gr2_database_2of2. ZipA systematic article1. When installing the system, select1 "Oracle Server Base" 2 "Compiler and

db:11.2.0.3.0Os:oracle-linux 5.7Company Fortress machine in order to safely re-plan, each group can only access the Fortress machine disk space of the individual groups, so the disk space of the online Oracle group cannot be accessed, causing the

Native IP Address: 192.168.1.163[Email protected] ~]$ Sqlplus/nologSql*plus:release 10.2.0.2.0-production on Sun 4 19:32:13 2014Copyright (c) 1982, 2005, Oracle. All rights Reserved.@>conn sys/oracleerror:ora-01034:oracle not

Reprinted from the Heaven of stealingMotivation:You want to do insert/update directly with an SQL statement in Oracle.DescriptionWhen writing SQL statements, we often encounter a large number of simultaneous insert/update statements, that is, when

Round () Function: Rounding functionReturns a numeric value that is the result of rounding operations with the specified precision.Syntax: Round (number[,decimals])Number: The function to be processedDecimals: Precision, default is 0;Select round (12

Test Oracle 11GR2 RAC installation and configuration-prerequisite configuration stage Install Oracle 11GR2 11.2.0.4 RAC cluster based on Linux RedHat 6.4 in VMwarevCenter Server 1. Network Planning Public and private must be divided into different

Use a. NET application to connect to the Oracle database. netoracle Recently, I was asked by my friends, "Why is there always an error in connecting the. NET application to the Oracle database ?", I think this is because we usually use Microsoft

Oracle SQL classical query expert Article 4 Oracle SQL classical query expert Article 4 This article is the fourth article on typical query of OracleSQL. It is just the author's own opinion. If you have any questions, I hope you can provide

"SQL * PLUS help unavailable" solution step, sqlplus SQL * PLUS is the most common CMD interface for oracle database management. The help system provides quick guidance and help for us to execute some commands, this feature is installed by default

Oracle 11g archive log study _ 1, oracle11g ARCHIVE _ 1 Oracle Database Operations are recorded in the redo log for undo (rollback) Or redo (redo) in case of database exceptions ). Redo logs are divided into online logs and archive logs. Oracle has

Solution to deadlock in Oracle Data Tables: oracle Solution During database management, tables are often locked due to some unreasonable operations on data tables. The following describes how to find which tables are locked by which users, and how