Use SQL_Course;
GO
-------------------------
-- Create Customers table
-------------------------
CREATE TABLE Customers
(
  cust_id      char(4)  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 ,
  CONSTRAINT PK_Customers PRIMARY KEY CLUSTERED (cust_id) 
);

------------------------
-- 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 ,
  CONSTRAINT PK_Products PRIMARY KEY CLUSTERED  (prod_id) 
);

-----------------------
-- 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 ,
  CONSTRAINT PK_Vendors PRIMARY KEY CLUSTERED (vend_id)
);

----------------------
-- Create Orders table
----------------------
CREATE TABLE Orders
(
  order_num  int      NOT NULL ,
  order_date datetime NOT NULL ,
  cust_id    char(4) NOT NULL ,
  CONSTRAINT PK_Orders PRIMARY KEY CLUSTERED (order_num)
);

--------------------------
-- 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 ,
CONSTRAINT PK_Order_Items PRIMARY KEY CLUSTERED (order_num, order_item)
);

----------------------
-- Define foreign keys
----------------------
ALTER TABLE OrderItems ADD
CONSTRAINT FK_OrderItems_Orders FOREIGN KEY (order_num) REFERENCES Orders (order_num),
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);
