oracle 10g tutorial

Oracle 10g Tutorial

Oracle 10g is an enterprise-level database management system launched by Oracle Corporation and is commonly used in large enterprises and government agencies. It provides a variety of features and tools for managing, storing and processing large amounts of data. The following is a simple Oracle 10g tutorial to help beginners understand and get started with this database system.

1. Installing Oracle 10g

Installing Oracle 10g requires downloading and running the installation program. During the installation process, you need to set the database username, password, database instance name and other information. After successful installation, you can find the Oracle 10g icon on your computer and open it.

2. Create database

Creating a database is the first step in using Oracle 10g. You can create a new database instance or use an existing database. When creating a database, you need to specify a name and location (where the data is stored) for the database.

3. Create table

In Oracle 10g, the table is the main object for storing data. You can use SQL statements to create a new table and specify attributes such as column names, types, and sizes. For example, here is an example of creating a table named "employees":

CREATE TABLE employees
(

employee_id   INT,
first_name    VARCHAR2(50),
last_name     VARCHAR2(50),
email         VARCHAR2(100),
phone_number  VARCHAR2(20),
hire_date     DATE,
job_id        VARCHAR2(50),
salary        NUMBER(10,2),
commission    NUMBER(10,2),
manager_id    INT,
department_id INT

);

4. INSERT DATA

After creating the table, you need to insert data into the table. You can use the INSERT statement to insert data into a table and specify column values. For example:

INSERT INTO employees (employee_id, first_name, last_name, email, phone_number, hire_date, job_id, salary, commission, manager_id, department_id)
VALUES (1001, 'John', 'Doe', ' john.doe@example.com', '123-456-7890', TO_DATE('2021/01/01', 'yyyy/mm/dd'), 'MANAGER', 5000, NULL, NULL, 1);

5. Querying data

Querying data is the most basic function of using Oracle 10g. You can use the SELECT statement to retrieve data from a table. For example, the following is an example of retrieving all employees in the employees table:

SELECT *
FROM employees;

6. Use the WHERE clause to filter data

WHERE clause is used to filter data. It can filter data based on multiple conditions and return records that meet the conditions. For example:

SELECT *
FROM employees
WHERE department_id = 1
AND job_id = 'MANAGER';

7. Update record

UPDATE statement is used to modify records in the table. You can use the UPDATE statement to change individual, multiple, or all records. For example:

UPDATE employees
SET salary = 5500
WHERE employee_id = 1001;

8. Delete records

DELETE statement is used to delete records in the table. You can use the DELETE statement to delete single, multiple or all records. For example:

DELETE FROM employees
WHERE employee_id = 1001;

In addition, Oracle 10g also provides many other functions and tools, such as views, indexes, stored procedures and triggers. These features and tools can better organize and manage the database and improve the performance and reliability of the database system.

To sum up, Oracle 10g is a powerful enterprise-level database management system that provides a variety of functions and tools for organizing and managing large amounts of data. Some basic usage methods are introduced here so that beginners can get started and start using this database system as soon as possible.

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