As an example of a relational database, consider the tables used by a small firm to process product orders. The first table form contains customer information. Here, each record contains information about the customer's name and address, payment details, contact phone number, etc.
Each data attribute (information element) is placed in a separate column of the finland mobile database information base. All columns have their own unique identifier for each row (key). The second table form contains separate records with the identifier of the client who submitted the application, the name of the ordered product, its quantity and characteristics. As we can see, this table does not contain client data (name, phone, address, etc.).
Which are the basic objects of a relational database, have only one common component. This is the column identifier. It establishes the relationship between the two tables. Now consider what happens when the application the company uses to process customer requests submits an order to the database.