測试假设成功则点击连接，记得角色要写SYSDBA
3. 执行脚本
之后把SQL必知必会的脚本拷到工作表中并点击执行脚本
首先进行表的创建
输入代码：
--------------------------------------------- -- Sams Teach Yourself SQL in 10 Minutes -- http://www.forta.com/books/0672325675/ -- Example table creation scripts for Oracle. --------------------------------------------- ------------------------- -- Create Customers table ------------------------- CREATE TABLE Customers ( cust_id char(10) NOT NULL , cust_name char(50) NOT NULL , cust_address char(50) NULL , cust_city char(50) NULL , cust_state char(5) NULL , cust_zip char(10) NULL , cust_country char(50) NULL , cust_contact char(50) NULL , cust_email char(255) NULL ); -------------------------- -- Create OrderItems table -------------------------- CREATE TABLE OrderItems ( order_num int NOT NULL , order_item int NOT NULL , prod_id char(10) NOT NULL , quantity int NOT NULL , item_price decimal(8,2) NOT NULL ); ---------------------- -- Create Orders table ---------------------- CREATE TABLE Orders ( order_num int NOT NULL , order_date date NOT NULL , cust_id char(10) NOT NULL ); ------------------------ -- Create Products table ------------------------ CREATE TABLE Products ( prod_id char(10) NOT NULL , vend_id char(10) NOT NULL , prod_name char(255) NOT NULL , prod_price decimal(8,2) NOT NULL , prod_desc varchar(1000) NULL ); ----------------------- -- Create Vendors table ----------------------- CREATE TABLE Vendors ( vend_id char(10) NOT NULL , vend_name char(50) NOT NULL , vend_address char(50) NULL , vend_city char(50) NULL , vend_state char(5) NULL , vend_zip char(10) NULL , vend_country char(50) NULL ); ---------------------- -- Define primary keys ---------------------- ALTER TABLE Customers ADD CONSTRAINT PK_Customers PRIMARY KEY (cust_id); ALTER TABLE OrderItems ADD CONSTRAINT PK_OrderItems PRIMARY KEY (order_num, order_item); ALTER TABLE Orders ADD CONSTRAINT PK_Orders PRIMARY KEY (order_num); ALTER TABLE Products ADD CONSTRAINT PK_Products PRIMARY KEY (prod_id); ALTER TABLE Vendors ADD CONSTRAINT PK_Vendors PRIMARY KEY (vend_id); ---------------------- -- Define foreign keys ---------------------- ALTER TABLE OrderItems ADD CONSTRAINT FK_OrderItems_Orders FOREIGN KEY (order_num) REFERENCES Orders (order_num); ALTER TABLE OrderItems ADD CONSTRAINT FK_OrderItems_Products FOREIGN KEY (prod_id) REFERENCES Products (prod_id); ALTER TABLE Orders ADD CONSTRAINT FK_Orders_Customers FOREIGN KEY (cust_id) REFERENCES Customers (cust_id); ALTER TABLE Products ADD CONSTRAINT FK_Products_Vendors FOREIGN KEY (vend_id) REFERENCES Vendors (vend_id);