Oracle

1. UsersUsers in Oracle are divided into two major categories1) when the Oracle database server is created, users that are automatically created by the system are called system users , such as Sys.2) users created by the system users, called

Overview:The flashback technology is part of Oracle's powerful database backup recovery mechanism, which provides fast and minimal recovery (most of the flashback functionality can be done in the database online state) When a logical error occurs in

Review what is a transaction?An indivisible sub-operation forms a whole, which either executes successfully or fails all. Example: TransferReview Why do you use transactions?If you do not have a transaction, for example, a user may have increased

Disclaimer: Scott or HR call username/scheme name/space nameScott--tigerHR-----LionQuery who the current user isShow user;650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/87/1A/wKiom1fUF4jBIjRCAAAPoOM61GI926.jpg "title=" 004. JPG "alt="

Hand first need to download oracle11g patch installation package, generally only paid users to obtain the installation package, other users can not get, how to do?Omnipotent Internet can do, can use http://www.wangpansou.cn/all other users put in

For the database, the most common operation is probably the query, a variety of complex queries often to engage us exhausted. Of course, this is nothing. However, for some multi-table queries, we often have no clue, do not know how to operate. Below

dotconnect for OracleDotconnect for Oracle is a data generator control that provides direct Oracle database connectivity for the Microsoft. NET Framework. It is completely based on ADO. net method, so you can use standard ADO entirely. NET data

Hacking Oracle Part 3 code/Command execution: Http://www.tuicool.com/articles/A3Yzaqhttps://www.notsosecure.com/hacking-oracle-11g/The sharp Oracle Injection technology http://www.jb51.net/hack/17239.htmlHacking Oracle Part

Get ready Col empno for 9999;col ename for A10;col job for A10;col Mgr for 9999;col hiredate for A12;col sal for 9999;col Comm for 9 999;col Deptno for 99;col tname for A40;set pagesize 80; --Create a new table xxx_emp,

1.select:Syntax:SELECT [DISTINCT] {*,column [alias],...}From tableNote: [] the contents of the content represent the optional* represents all Columnsthe DISTINCT keyword can only be followed by the select keywordSpecify the column to query behind

Creating test tables and data 123456789 createtabletest(namevarchar2(10));insertintotest values(‘2-15‘);insert intotest values(‘2-33‘);insertintotest values(‘2-3‘);insertintotest values

Start:1.win+r---> cmd-----> sqlplus "/as sysdba"//Log in as sysdba (You can create users, assign permissions, etc.)Win+r---> cmd-----> Sqlplus username/password//Login with specified username / passwordWin+r---> cmd-----> SqlplusFollow the prompts

--Query the SQL statement that Oracle is executing and the user who executes the statement[SQL]View Plain copy select b.sid oracleid,           b.username  Login Oracle user name,    Li class= "alt" >B.SERIAL#,         spid 

Query Employee information in department 20th or department 30th using the set operationSELECT * from emp where deptno = 20unionselect * from emp where deptno = 30;650) this.width=650; "src="

User management, mainly to explain the SQL classification of DCL. DCL Data Data control statements, mainly have grant (grant) and revoke (recycling) two commands.--SYS LoginConn SYS/Orcl assysdba;--Create user dog, password Wangwang, at which time

SQL statement for querying and deleting duplicate records1, look for redundant records in the table, duplicate records are based on a single field (ID) to determineselect * FROM table where Id in (select ID from table group Byid have count (Id) > 1) 

/* divided into four steps * */* Step 1th: Create a temporary tablespace */Create temporary tablespace ycjytempfile ' D:\oracledata\ycjy.dbf 'size 50mAutoextend onnext 50m maxsize 20480mextent management Local;  /* Step 2nd: Create a data table

To establish the tablespace and the user's steps:UserCreate:Create user username identified by "password"; Authorization:Grant create session to user name; Grant create table to user name; Grant create tablespace to user name; Grant Create view to

Oracle InstallationFirst switch to root user, execute Xhost +Then switch to Oracle User and execute export display=:0.0Garbled execution Export Lang=us_enHere are some common questions to tell you about the following two situations:One is a locally

Three major types and implicit data type conversions in Oracle(1) varchar2 variable length/char fixed length-->number, for example: ' 123 '->123(2) Varchar2/char-->date, for example: ' 2 May-April -15 ', ' 2 May-April-15 '(3)