I can currently query the join of two tables on the equality of a foreign/primary key in the following way.
$result = mysql_query(\"SELECT * FROM `table1`
A possible solution:
SELECT Company.Company_Id,Company.Company_Name,
Invoice_Details.Invoice_No, Product_Details.Price
FROM Company inner join Invoice_Details
ON Company.Company_Id=Invoice_Details.Company_Id
INNER JOIN Product_Details
ON Invoice_Details.Invoice_No= Product_Details.Invoice_No
WHERE Price='60000';
-- tets changes