SQL creating a join between two tables - sql-server

Question

I want to create three tables.
Orders (contains an order ID and a customer name)
Products (contains a Product ID, description, and price)
Line Item (contains Order ID, Line Item ID, Product ID, and Quantity)
I want my web app to allow a customer to select an order number, and as a result, it will display the products that are in that order, the quantity of said products, the price of the products, and a total price of order that will be calculated on the fly in my code behind.
My SQL looks like this
CREATE TABLE Products
(
ProductID int NOT NULL,
ProductDescription varchar(MAX) NOT NULL,
ProductPrice smallmoney NOT NULL,
PRIMARY KEY (ProductID)
)
CREATE TABLE Orders(
OrderID int NOT NULL,
CustomerName varchar(MAX) NOT NULL,
PRIMARY KEY (OrderID)
)
CREATE TABLE LineItem(
LineItemID int NOT NULL,
OrderID int NOT NULL FOREIGN KEY REFERENCES Orders(OrderID),
ProductID int NOT NULL FOREIGN KEY REFERENCES Products(ProductID),
Quantity int NOT NULL,
PRIMARY KEY (LineItemID)
)
Here is the database diagram with the relationships.
Here is the result of a select all statement on all the tables
Are my relationships set up correctly for what I want to achieve? I'm sorry if this seems simple but I'm new to this and while the SQL Statements are pretty easy, the way to relate tables is not.

Answer 1

SELECT p.ProductPrice, p.ProductDescription, o.CustomerName, l.Quantity
FROM LineItem AS l
INNER JOIN Products AS p ON l.ProductID=p.ProductID
INNER JOIN Orders AS o ON l.OrderID=o.OrderID
ORDER BY l.LineItemID
will provide combined information from all of these tables. You may add any additional columns which you want to fetch data from.
INNER JOIN and JOIN keywords are syntactic sugar, which have same effect. While you're binding two tables by INNER JOIN, only results which contained in both of these tables will be returned.
With the ON keyword, you are defining the relational columns of tables. For example, in the clause INNER JOIN Products AS p ON l.ProductID=p.ProductID, I'm defining that the data are relational in column ProductID of table Products with column ProductID of table LineItem.

Answer 2

You have a many-to-many relationship between Products and Orders so in the structure of LineItem table I think you already have have the primary key (Product Id,OrderID) and I think you do not need to LocalItemID
CREATE TABLE LineItem(
OrderID int NOT NULL FOREIGN KEY REFERENCES Orders(OrderID),
ProductID int NOT NULL FOREIGN KEY REFERENCES Products(ProductID),
Quantity int NOT NULL,
PRIMARY KEY (OrderID ,ProductID )
)
and you can join the tables using this:
SELECT p.ProductPrice, o.CustomerName, li.Quantity
FROM LineItem AS li
JOIN Products AS p ON li.ProductID=p.ProductID
JOIN Orders ON li.OrderID=o.OrderID