how to create relationship in oracle database

Directory Introduction to Directory Software Environment install Oracle Listener start stop listener CREATE database database name db_name database instance name instance_name database name and instance name the relational operat

Label:Directory Directory Software Environment Objective Installing the Oracle Listener Start Stop Listener Create a database Database name Db_name DB Instance Name instance_name The relationship between the

database (note that sid cannot be used in these cases, also, the database name is used for alter database ). Many Oracle installation file directories are related to database names, such: Winnt: F: \ oracle \ product \ 10.2.0 \ o

The Oracle Database knows a table and queries a table with a primary foreign key relationship. The oracle Database -- Check whether the foreign key table NC56.CSCI has a corresponding primary key table SELECT. owner,. TABLE_NAME primary_table_name,. CONSTRAINT_NAME primary_t

for that user. This is the reason why we see schema names as database user names under the Enterprise Manager scheme. A schema cannot be created in an Oracle database, and to create a schema can only be resolved by creating a single user (although there is a CREATE SCHEMA s

1. maxdatafiles parameters in the control file For instructions on Oracle control files, refer to my previous blog: Oracle Control File Http://blog.csdn.net/tianlesoftware/article/details/4974440 There is a parameter in the control file of Oracle: maxdatafiles, which is used to control the maximum number of datafiles supported by the

organization and management in a database. It is the unit of data file disk storage space and the smallest unit of database I/O. The data block size is determined by the DB_BLOCK_SIZE parameter, the default value of DB_BLOCK_SIZE varies with Oracle versions. Mode object A schema object is an application that includes tables, clustering, views, index sequence gen

Relationship between Oracle database view and base table I. What is a view first? A view is actually a query SQL statement used to display relevant data in one or more tables or other views. A view uses the results of a query as a table. Therefore, a view can be considered as a stored query or a virtual table. Unlike a real table, a view does not require storage

, let's talk about the relationship between Oracle users, tablespaces, and data files: One user can use one or more tablespaces. One tablespace can also be used by multiple users. There is no affiliation between the user and the tablespace. The tablespace is a logical concept used to manage data storage. The tablespace is only related to the data file, and the data file is physical, a tablespace can contain

One of the most powerful features of Oracle view is that it can create a view with errors. For example, if the field in the view does not exist in the base table, the view can still be created successfully, One of the most powerful features of Oracle view is that it can create a view with errors. For example, if the fi

default schema for that user. This is the reason why we see schema names as database user names under the Enterprise Manager scheme.A schema cannot be created in an Oracle database, and to create a schema can only be resolved by creating a single user (although there is a CREATE