本教程向您介绍Oracle示例数据库，并提供链接供下载。

Oracle示例数据库简介

我们为您提供一个名为 OT 的Oracle示例数据库，它基于全球虚拟公司，销售计算机硬件，包括存储，主板，RAM，视频卡和CPU。

公司保存产品信息，如：名称，描述标准成本，标价，产品线。它还跟踪所有产品的库存信息，包括产品可用的仓库。由于该公司在全球运营，因此在世界各地拥有仓库。

公司记录所有客户信息，包括姓名，地址和网站。 每个客户至少有一个联系人，包括姓名，电子邮件和电话等详细信息。公司还对每位客户设置了信用限额，以限制客户可能欠的金额。

只要客户发出采购订单，就会在数据库中创建具有待处理状态的销售订单。当公司运送订单时，订单状态变成 - 运送。如果客户取消订单，则订单状态将被 - 取消。

除销售信息外，员工数据还记录了一些基本信息，如姓名，电子邮件，电话，职位，经理和雇用日期。

Oracle示例数据库图

以下举例说明示例数据库图表：

下载Oracle示例数据库

以zip文件格式下载以下示例数据库：

下载文件后，然后提取它。该zip文件包含以下的SQL文件：

• 文件：ot_create_user.sql - 用于创建OT用户和授予权限。
• 文件：ot_schema.sql - 用于创建数据库对象，如表，约束等
• 文件：ot_data.sql - 用于将数据加载到表中。
• 文件：ot_drop.sql - 用于删除示例数据库中的所有对象。

以上文件可通过加入 Oracle数据库技术QQ群(175248146)，从群文件里找到示例数据库(oraok.com)_11g.v1.zip文件并下载。

以下是用于创建数据库对象的语句。

-- regions
CREATE TABLE regions
  (
    region_id NUMBER GENERATED BY DEFAULT AS IDENTITY
    START WITH 5 PRIMARY KEY,
    region_name VARCHAR2( 50 ) NOT NULL
  );
-- countries table
CREATE TABLE countries
  (
    country_id   CHAR( 2 ) PRIMARY KEY  ,
    country_name VARCHAR2( 40 ) NOT NULL,
    region_id    NUMBER                 , 
    CONSTRAINT fk_countries_regions FOREIGN KEY( region_id ) REFERENCES regions( region_id ) ON DELETE CASCADE
  );

-- location
CREATE TABLE locations
  (
    location_id NUMBER GENERATED BY DEFAULT AS IDENTITY START WITH 24 
                PRIMARY KEY       ,
    address     VARCHAR2( 255 ) NOT NULL,
    postal_code VARCHAR2( 20 )          ,
    city        VARCHAR2( 50 )          ,
    state       VARCHAR2( 50 )          ,
    country_id  CHAR( 2 )               , 
    CONSTRAINT fk_locations_countries 
      FOREIGN KEY( country_id )
      REFERENCES countries( country_id ) 
      ON DELETE CASCADE
  );
-- warehouses
CREATE TABLE warehouses
  (
    warehouse_id NUMBER 
                 GENERATED BY DEFAULT AS IDENTITY START WITH 10 
                 PRIMARY KEY,
    warehouse_name VARCHAR( 255 ) ,
    location_id    NUMBER( 12, 0 ), 
    CONSTRAINT fk_warehouses_locations FOREIGN KEY( location_id ) REFERENCES locations( location_id ) ON DELETE CASCADE
  );
-- employees
CREATE TABLE employees
  (
    employee_id NUMBER 
                GENERATED BY DEFAULT AS IDENTITY START WITH 108 
                PRIMARY KEY,
    first_name VARCHAR( 255 ) NOT NULL,
    last_name  VARCHAR( 255 ) NOT NULL,
    email      VARCHAR( 255 ) NOT NULL,
    phone      VARCHAR( 50 ) NOT NULL ,
    hire_date  DATE NOT NULL          ,
    manager_id NUMBER( 12, 0 )        , 
    job_title  VARCHAR( 255 ) NOT NULL,
    CONSTRAINT fk_employees_manager FOREIGN KEY( manager_id ) REFERENCES employees( employee_id ) ON DELETE CASCADE
  );
-- product category
CREATE TABLE product_categories
  (
    category_id NUMBER 
                GENERATED BY DEFAULT AS IDENTITY START WITH 6 
                PRIMARY KEY,
    category_name VARCHAR2( 255 ) NOT NULL
  );

-- products table
CREATE TABLE products
  (
    product_id NUMBER 
               GENERATED BY DEFAULT AS IDENTITY START WITH 289 
               PRIMARY KEY,
    product_name  VARCHAR2( 255 ) NOT NULL,
    description   VARCHAR2( 2000 )        ,
    standard_cost NUMBER( 9, 2 )          ,
    list_price    NUMBER( 9, 2 )          ,
    category_id   NUMBER NOT NULL         ,
    CONSTRAINT fk_products_categories FOREIGN KEY( category_id ) REFERENCES product_categories( category_id ) ON DELETE CASCADE
  );
-- customers
CREATE TABLE customers
  (
    customer_id NUMBER 
                GENERATED BY DEFAULT AS IDENTITY START WITH 320 
                PRIMARY KEY,
    name         VARCHAR2( 255 ) NOT NULL,
    address      VARCHAR2( 255 )         ,
    website      VARCHAR2( 255 )         ,
    credit_limit NUMBER( 8, 2 )
  );
-- contacts
CREATE TABLE contacts
  (
    contact_id NUMBER 
               GENERATED BY DEFAULT AS IDENTITY START WITH 320 
               PRIMARY KEY,
    first_name  VARCHAR2( 255 ) NOT NULL,
    last_name   VARCHAR2( 255 ) NOT NULL,
    email       VARCHAR2( 255 ) NOT NULL,
    phone       VARCHAR2( 20 )          ,
    customer_id NUMBER                  ,
    CONSTRAINT fk_contacts_customers FOREIGN KEY( customer_id ) REFERENCES customers( customer_id ) ON DELETE CASCADE
  );
-- orders table
CREATE TABLE orders
  (
    order_id NUMBER 
             GENERATED BY DEFAULT AS IDENTITY START WITH 106 
             PRIMARY KEY,
    customer_id NUMBER( 6, 0 ) NOT NULL, 
    status      VARCHAR( 20 ) NOT NULL ,
    salesman_id NUMBER( 6, 0 )         , 
    order_date  DATE NOT NULL          ,
    CONSTRAINT fk_orders_customers FOREIGN KEY( customer_id ) REFERENCES customers( customer_id ) ON DELETE CASCADE,
    CONSTRAINT fk_orders_employees FOREIGN KEY( salesman_id ) REFERENCES employees( employee_id ) ON DELETE SET NULL
  );
-- order items
CREATE TABLE order_items
(
    order_id   NUMBER( 12, 0 )                                , 
    item_id    NUMBER( 12, 0 )                                ,
    product_id NUMBER( 12, 0 ) NOT NULL                       , 
    quantity   NUMBER( 8, 2 ) NOT NULL                        ,
    unit_price NUMBER( 8, 2 ) NOT NULL                        ,
    CONSTRAINT pk_order_items  PRIMARY KEY( order_id, item_id ),
    CONSTRAINT fk_order_items_products  FOREIGN KEY( product_id ) REFERENCES products( product_id ) ON DELETE CASCADE,
    CONSTRAINT fk_order_items_orders FOREIGN KEY( order_id ) REFERENCES orders( order_id ) ON DELETE CASCADE
);
-- inventories
CREATE TABLE inventories
(
    product_id   NUMBER( 12, 0 )        , 
    warehouse_id NUMBER( 12, 0 )        , 
    quantity     NUMBER( 8, 0 ) NOT NULL,
    CONSTRAINT pk_inventories  PRIMARY KEY( product_id, warehouse_id ),
    CONSTRAINT fk_inventories_products FOREIGN KEY( product_id ) REFERENCES products( product_id ) ON DELETE CASCADE,
    CONSTRAINT fk_inventories_warehouses FOREIGN KEY( warehouse_id ) REFERENCES warehouses( warehouse_id ) ON DELETE CASCADE
);

在本教程中，我们介绍了Oracle示例数据库并展示了如何下载它。现在，您应该准备好在Oracle数据库服务器中创建示例数据库以供接下来的章节中练习。