The secret of Oracle database version: It turns out that Oracle has so many versions!

The secret of Oracle database version: It turns out that Oracle has so many versions!

Oracle is a world-renowned database management system with many versions, each with its own unique features and functions. In this article, we will delve into the features of different versions of Oracle database and provide some specific code examples.

1. Oracle database version classification

Oracle database versions can be classified in different ways. Common classification methods include:

1. Divided by release year: Oracle database versions are usually identified by year, such as Oracle 10g, Oracle 11g, Oracle 12c, etc.
2. Divided by functions and features: Different versions of Oracle database have different functions and features, such as Oracle Database Standard Edition, Oracle Database Enterprise Edition, etc.
3. Divided according to the degree of update and repair: Different versions of the Oracle database can also be divided according to the degree of update and repair, such as Oracle Database 12c Release 1 and Oracle Database 12c Release 2, etc.

2. Oracle database version example

1. Oracle 10g

Oracle 10g is the 10th major version of Oracle database, released in 2003 release. It introduces many important features such as automatic storage management, automatic diagnostic monitor, etc. Here is a simple PL/SQL code example:

CREATE TABLE employees (
    employee_id number(6),
    first_name varchar2(50),
    last_name varchar2(50),
    email varchar2(100),
    hire_date date
);

2. Oracle 11g

Oracle 11g is the 11th major version of Oracle Database, released in 2007. It introduces many new features such as virtual columns, automatic SQL tuning, etc. The following is a simple stored procedure example:

CREATE OR REPLACE PROCEDURE get_employee_info (p_employee_id IN NUMBER, p_info OUT VARCHAR2) AS
BEGIN
    SELECT first_name || ' ' || last_name
    INTO p_info
    FROM employees
    WHERE employee_id = p_employee_id;
END;

3. Oracle 12c

Oracle 12c is the 12th major version of the Oracle database, released in 2013. It introduces many innovative features such as multi-tenant architecture, internal data compression of the database, etc. The following is a simple trigger example:

CREATE OR REPLACE TRIGGER salary_check
BEFORE INSERT OR UPDATE ON employees
FOR EACH ROW
BEGIN
    IF :new.salary < 3000 THEN
        RAISE_APPLICATION_ERROR(-20001, 'Salary must be greater than 3000');
    END IF;
END;

3. Summary

Oracle database has many versions, each version has its unique features and functions. In this article, we briefly introduce some of the features of Oracle 10g, Oracle 11g, and Oracle 12c and provide some simple code examples. It is hoped that these examples can help readers better understand different versions of Oracle database and provide reference and guidance for their practical applications.

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