Oracle

Connection sqlplus not like MySQL can turn history, by installing Rlwrap1, installation rlwrap-0.37.tar.gzTar zxvf rlwrap-0.37.tar.gzCD rlwrap-0.37./configure#yum List|grep termcap#yum List|grep ReadLine#yum-y Install libtermcap-devel readline-devel.

Basic Table Example: Basic table650) this.width=650; "src=" Https://s3.51cto.com/wyfs02/M01/91/BF/wKiom1j4Ixuy0FFJAAEm0C19v18480.png "style=" float : none; "title=" 1.png "alt=" Wkiom1j4ixuy0ffjaaem0c19v18480.png "/>650) this.width=650; "src=" Https:

--like fuzzy Query, wildcard: '% ' means substituting one or more characters, ' _ ' in place of one characterSELECT * from v_test where v_name like ' _bce% ';Escape character: You can escape a wildcard ('% ', ' _ ') as a character, rather than the

When you create a database, you can specify the character set (CHARACTER set) and the national character set (Nation CHARACTER set, additional character set).1. Character Set:(1) used to store char, VARCHAR2, CLOB, long and other types of data(2) to

Create schemaThis statement does not actually create a schema that automatically creates a schema when the user is created, which allows you to populate your schema with tables and views and authorization for those objects, without multiple

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----1, cause analysis----Through the analysis of the user's reflection, it is found that the improper setting of the character set is the key problem affecting the Chinese character display of Oracle database. So what about the character set? The

1. Create a tableCREATE TABLE It_employees(ENPLOYEES_ID Number (6) is not NULL UNIQUE,First_Name VARCHAR2 (20),Last_Name VARCHAR2 (+) not NULL,EMAIL VARCHAR2 (25),Phone_number VARCHAR2 (20),job_id VARCHAR2 (10),SALARY number (8,2),MANAGER_ID Number (

--View all deleted tablesSELECT * from Dba_recyclebin where droptime > ' 2017-04-11:12:00:00 '--Restore a single tableFLASHBACK TABLE HT_BM to before DROP;--Batch recovery, login with sqlplus, use commandSpool D:/flashback.sql;Select ' Flashback

1 、--Create an index, after it is created, is stored in ascending order of last_name value, it_lastname as the index nameCreate [unique] [cluster] index name on table name (field name);Unique: Index values cannot be duplicated.Cluster: The index

Tagged with: href Batch table space size images LTE modify table tar concernsNote: In general, the table space to modify a table requires that the table space and its corresponding index table space be modified at the same time, and that the table

This article was released under the Creative Commons licenseRecently in the study of Oracle 11gR2, writing SQL lack of demo table, studying the official information of his family found that a piece of Oracle has been prepared for US sample

LENGTHB (string) computes the byte length of a string: returns the length of the strings, in bytesLength (String) calculates the string's characters: the length of the returned strings, in charactersFor single-byte characters, LENGTHB and length are

Tag: Create table operation query value Val where Rtu err catDual is a virtual table that makes up the syntax rules for SELECT, and Oracle guarantees that there will always be only one record in dual. We can use it to do a lot of things, as follows:1

Restart the Oracle database and listener under Linux:Method 1:Log in to Linux with root SSH and open the terminal to enter the following command:CD $ORACLE _home #进入到oracle的安装目录Dbstart #重启服务器Lsnrctl Start #重启监听器CD $ORACLE _home

The control file is a small binary file (around 10MB) that contains database structure information, including data files and log file information. Control files are created automatically when the database is created and updated when a physical

One, install the Oracle dependency package# yum Install binutils compat-libstdc++-33 compat-libstdc++-33.i686 elfutils-libelf elfutils-libelf-devel gcc gcc-c++ glibc glibc.i686 glibc-common glibc-devel glibc-devel.i686 glibc-headers ksh libaio

The role of constraints: defining rules, ensuring integrityOne, non-null constraints1. Setting a non-null constraint when creating a tableCREATE TABLE Userinfo_1(ID number (6,0),Username VARCHAR2 () not NULL,Userpwd varchar2 () NOT NULL)2. Setting a

Redo Log BuffersEach time a user modifies the data, a related record is generated in the redo log buffer. Redo log buffer is a cyclic buffer that records the redo entries of user modification operations. LGWR caches the redo entries in the Redolog

Method/Step First, you should make sure that you have a server that has Oracle installed. And this server is on the same network as the computer that is connecting it (in general, in a local area network, if the server is in the public