oracle in database archiving

Oracle Database for the Data Type of database fields, oracle Data TypeModify the Data Type of Oracle Data Columns Method 1: // Create the same temporary table Create table T_BUSINESS_MODEL_TEMP as select * from T_BUSINESS_MODEL where 1 = 2;// Change the data type of the tem

Oracle Database BASICS (2): oracle Database Basics 1. Table Name naming rules: The table name must start with a letter and cannot exceed 30 characters. do not have any Oracle reserved words.2. Data TypeCharacter Type:Char: 2000 characters long, efficientVarchar2: 4000 charac

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 name and the instance name Opera

into' Student 'VALUES('8','Lee 48','123','male',' +','Jingan, Shanghai city'); INSERT into' Student 'VALUES('9','Zhang 39','111','male',' +','Shiyan, Hubei province'); INSERT into' Student 'VALUES('Ten','Lee 40','123','male',' +','Jingan, Shanghai city'); I. Querying 5~10 data MySQL Paging query: SELECT * FROM student limit 5, 10; Oracle Paging query: SELECT * FROM (select *,rownum rn from student) where RN between 6 and 10; SQL Server Paging q

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_table_key_name, B. owner, B. TABLE_NAME foreig

Oracle Database basic learning (6) subquery, oracle Database A subquery contains multiple nested query statements in a select statement. 1Use subquery in THE where clause (generally, return "Single Row, single column" Single Row, multiple columns "multiple rows, single column" (in, any, all can be provided )) Example

Basic Oracle Database Learning (III), oracle Database The emp dept salgrade bunus structure of Oracle's four tables. Remember that it is helpful for later SQL statement learning. Employee table (emp) No. Field Type Description 1 Empno NUMBER (4) Employee ID, which is unique

oracle| Data | database Finishing: Fenng Date: 25-oct-2004 Source: Http://www.dbanotes.net Version: 0.91 Sometimes, as a DBA, you may need to collect the deployed Oracle database information. Hardware configuration, operating system conditions, software installation path, databas