Oracle

Permissions in rights management include system permissions and object permissions. Before we explain Rights management, let's start by understanding the user's creation and authorization.1. Creating users and authorizing? Default User　Now that you

This summary is just a few new contacts to make a list, to facilitate later into the study to see1, constant representation: constant2, type%Type; example: Table name. Column Name%type;--indicates the type of the variable is the type of this column3,

--KG is a mistakenly deleted table Sql> select COUNT (*) fromkg; COUNT (*)----------820861sql> Delete from kg;820861 rows deletedsql> commit;  Commit completesql> Select COUNT (*) from kg; COUNT (*)----------0sql> rollback;  Rollback completesql>

Fourth. Index4.1 Definitions An index is an optional structure associated with a table. By creating indexes, you can improve the performance of data updates and retrievals. The Oracle index provides a direct access path to the data row.

There is a product list, if you are asked to inquire about the first 5 items of the latest listed date. How do you write your SQL statement? First, judge the condition and order again? Wrong.The idea is very simple, is to first order, and then take

When IMP imports a table, you are prompted with no permissions on Tablespace ' icity '.After Baidu, view to use DBA user login, write SQL statement execution can authorize.Alert User Dg_bagsh quota unlimited on icity;Alert User Dg_bagsh quota

Oracle database and MySQL, SQL Server, it is in the same database can be defined multiple table space, the different table spaces are independent of each other, each user has a default table space, so basically different user operation of the data

One: Install Oracle client on sqlserver2005 server, run NETCA create TnsnameSecond: Fill in as shownWhere the first line is filled inSecond, three lines: fill in the diagramLine four: Fill in the Tnsname650) this.width=650; "style="

Create DATABASE (DCA): http://jingyan.baidu.com/article/cbcede07cf42ef02f40b4dc2.htmlCREATE TABLE (connect database, SQL Create data table): Http://wenku.baidu.com/link?url=hLohng2doiS3-TErM44ERgN54tGeGTqOOomP_

Due to changes in demand. Now, we want a type number (8,2) field type to change char.The general idea is as follows:Rename the field name that you want to change the type to back up, and then add a field with the same name as the field name of the

Create or replace procedure Prc_get_sex(Stuname Student.name%type)AsStusex Student.sex%type;BeginSelect Sex to Stusex from student where name=stuname;Dbms_output.put_line (' Students ' | | stuname | | ' The sex is: ' | | Stusex);exceptionWhen

The reason that the database object cannot drop is that the object is being executed and that the resource was not freed after the object was executed.The first case is to cancel or pause the invocation of the object that might have been deleted.in

In oracle, what happens when a value in date time format is inserted into a field in varchar2 format? -- Create table test1create table TEST1 (ID VARCHAR2 (40) default sys_guid (), TDATE VARCHAR2 (200 )) tablespace APP_TX_DATApctfree 10 pctused 40

Create Table space, user, and permission configuration in oracle Different from mysql and sqlserver databases, an oracle database can define multiple tablespaces in the same database. Different tablespaces are independent of each other. each user

Oracle primary and foreign key management Use the primary and foreign key constraints to ensure data integrity. 1. query all the constraints on the table Select * from user_constraints tWhere t. table_name = 'father '; 2. query tables with

Basic OracleDDL operations Share with you my learning notes on Oracle Database Definition Language 1. Create Table space syntaxCreate tablespace test -- tablespace nameDatafile 'd: \ oradata \ orcl \ test. dbf '-- data file corresponding to the

Oracle database backup and recovery----------------------- Export Database ----------------------------1. Export the complete databaseExp userName/userPassword file = d: \ database. dmp full = y2. Export the object of a user in the databaseExp

Oracle Advanced Programming Oracle's advanced programming mainly involves the use of the ten objects in the database. Here, I will share with you some of my notes on these skills. Hope to help you! Before reading this article, you can also refer to

Oracle uses a string-indexed two-dimensional array   -Sample data store name product sales a apple 3000A BANANA 2000B APPLE 5000B MELON 100-construct packagecreate or replace package p_nested_array ISSUBTYPE prod_name IS VARCHAR2 (200); SUBTYPE

New Feature of oracle11g -- AdaptiveCursorSharing (ACS) 1. ACS Overview Oracle Database 11g provides the Adaptive Cursor Sharing (ACS) function to overcome the possibility of Sharing a Cursor that should not be shared in the past. ACS uses two new