Shop database, SQL for order table - sql

Question

I have a University project and I have to create a DB for a plant shop.
I have a problem with the order table. At the moment it only allows a customer to buy one product at a time but in real life a customer buys many products at a time.
For example,
We have a customer John Doe, and he bus two products that are in the product table. How do I pull those two (or more) products and add them to one order table?
Below is the SQL code I wrote:
CREATE TABLE customer(
customer_id INT(3),
customer_fname VARCHAR(20),
customer_lname VARCHAR(20),
customer_gender CHAR(1),
customer_tel VARCHAR(20),
customer_email VARCHAR(30),
customer_dateJoined DATE,
address_id INT(3),
PRIMARY KEY(customer_id),
INDEX(customer_id),
FOREIGN KEY(customer_id) REFERENCES address);
CREATE TABLE address(
adress_id INT(3),
customer_street VARCHAR(30),
customer_town VARCHAR(30),
customer_postcode CHAR(7),
PRIMARY KEY(address_id),
INDEX(address_id),
FOREIGN KEY(address_id) REFERENCES customer(address_id),
FOREIGN KEY(address_id) REFERENCES employee(address_id));
CREATE TABLE product(
product_id INT(5),
product_name VARCHAR(20),
product_season VARCHAR(15),
product_price NUMERIC(4,2),
product_origin VARCHAR(15),
product_type VARCHAR(15),
product_inStock BOOLEAN,
PRIMARY KEY(product_id),
INDEX(product_id));
CREATE TABLE orders(
order_id INT(3),
customer_id INT(3),
employee_id INT(3),
product_name VARCHAR(20),
quantity INT(4),
order_date TIMESTAMP,
PRIMARY KEY(order_id),
INDEX(order_id));
CREATE TABLE employee(
employee_id INT(3),
employee_fname VARCHAR(20),
employee_lname VARCHAR(20),
address_id INT (3),
employee_pay NUMERIC(2,2),
employee_daysOff INT(2),
employee_hoursWorked INT(3),
PRIMARY KEY(staff_id),
INDEX(staff_id));

Answer 1

You have to create Kettle Table customer_orders, in this table you store customer_id and order_id and connect them with foreign keys to the customer and orders tables.
Like in the following query:
CREATE TABLE customer_orders(
customer_id INT(3),
order_id INT(3),
PRIMARY KEY(customer_id, order_id),
FOREIGN KEY(customer_id) REFERENCES customer(customer_id),
FOREIGN KEY(order_id) REFERENCES orders(order_id)
);

Answer 2

CREATE TABLE sales.stores (
store_id INT IDENTITY (1, 1) PRIMARY KEY,
store_name VARCHAR (255) NOT NULL,
phone VARCHAR (25),
email VARCHAR (255),
street VARCHAR (255),
city VARCHAR (255),
state VARCHAR (10),
zip_code VARCHAR (5)
);

Answer 3

One way to design this is to have two tables for Orders.
OrderHeader :- This contains order id with customer details.
OrderItem :- Contains Line items per order.
OrderHeader fields could be
order_id //primary key
customer_id
employee_id
order_date
OrderItem :- Fields could be
order_id //composite key
line_Item_id //composite key
product_id,
product_quant