Oracle

The following articles mainly describe the table connection statements for Oracle Outer join and cross join. Oracle database connections include the inner join statements) oracle Outer join, full join), left join), right join, and cross join ). The

Many people have asked me some questions about Oracle character sets, such as data migration in different databases and data exchange between different systems, because of the Oracle character set, the Migration fails or the data in the database

This article describes how to correctly install the Oracle 10g operating solution in redhat linux. In fact, many people do not understand what g in Oracle 10g means. In fact, it is the abbreviation form of grid, which means grid. Currently, it is a

The following articles mainly explain the Oracle Raw type in detail. We first talk about the concept of RAW, which is similar to CHAR in that aspect, the declared method is RAW (L). It takes L as the length, and the relevant bytes as the unit. It

How should I write SQL recursive statements in oracle databases? The following is an example of using SQL recursive statements in oracle for your reference. Example: Pid idA BA cA eB b1B b2C c1E e1E e3D d1Specify pid = a and selectA BA cA eB b1B b2C

The Oracle case statement is one of the most commonly used statements. The following describes the syntax of the Oracle case statement and provides an example to help you. When multiple condition branch statements are executed, the Oracle case

Oracle alarm logs are frequently seen. The following describes how to access oracle alarm logs by using oracle External tables. 1. Create a user and grant permissions SQL>create user checker identified by password default tablespace users quota 

The Oracle service port has many problems. The following describes how to open the Oracle service port on the firewall. It is helpful for you to learn about the Oracle service port. To enable the Oracle client to connect to an Oracle server

Oracle 11gThe clientLinuxThe configuration process is a little bit difficult, but as long as we configure step by step, there is nothing. This article describes how to configure the Oracle 11g client on Linux. First download several compressed

Oracle DatabaseInEM Console ReconstructionEM startup error. The error code is as follows: C:\Documents and Settings\GAOYANG>set ORACLE_SID=rman    C:\Documents and Settings\GAOYANG>emctl start dbconsole     OC4J Configuration issue. D:\

When we are working on database projects, there are only two principles to optimize the data store: one is Data Storage in blocks, which facilitates data dumping and discipline; the other is processing, the speed at which data is provided. This

Last time we introduced:SQL/PLUS Study NotesThis section describes the SQL/PLUS learning notes.Edit the current line command in the bufferNext, let's take a look at this part. (1). change (enable you to change the current line) First, use the list

Oracle Database diagnostic tool RDARDA is short for Remote Diagnostic Agent. It is a tool used by Oracle to collect and analyze databases. Running this tool will not change any system parameters, the data collected by RDA is comprehensive, which

Insert is a common statement in T-SQL. Insert INTO table (field1, field2 ,...) values (value1, value2 ,...) this form is essential for application development. However, during the development and testing processes, we often encounter situations

Install oracle 11g in RHEL6.2 x86_64By Gong ChangyuIf you encounter any problems during the installation process, you can discuss them and learn together. If there are any errors, please let us know. Thank you.1. First modify the/etc/sysctl. conf

An error occurred while importing the dmp exported from Oracle 11G to the 10g Database.(IMP-00010: Failed header verification because it is not a valid exported file) SolutionBecause the server has oracle 11 GB and oracle 10 Gb locally, the dmp

Today, I came into contact with the group by clause with the rollup clause (it's really ugly. I 've been in contact with ORACLE for a year or two before I know this usage ), the functions produced by the group by clause with the rollup clause are

Flexible application of ROWNUM virtual column Rownum is not a physical column actually exists in the table, but a virtual column that can be used in any SQL statement. If you can correctly understand the concept and features of Rownum, you can apply

Undo Series Study: undo segments and zones 1) rollback segments are a piece of space on the disk www.2cto.com 2) when a transaction starts: first, write the data before and after the change to the redo log file. Second, write the data and related

When logging on to Oracle SQL developer, the problem is solved. When logging on to oracle's built-in SQL developer, the connection method was not selected at the beginning. The default connection type "Basic" was used. I filled in the connection