An illustration of a relational database
Here are two basic tables that a small business could use to handle product orders. Each record in the first table, which is a customer information table, contains the following details: the customer's name, address, phone number, shipping and billing information, and other contact details. Every piece of data, or attribute, has its own column, and each row in the database has a unique ID, or key. Each record in the second table, which is a customer order table, contains the ID of the customer who placed the order, the product they ordered, the quantity, the size and color they chose, and other details, but not their name or contact details.
The ID column, also known as the key, is the only similarity between these two tables. However, the relational database is able to establish a relationship between the two tables because of that shared column. The database can then access the customer order table, retrieve accurate product order details using the customer ID, and use the customer ID to retrieve the customer's billing and shipping details from the customer info table when the company's order processing application submits an order to the database. The right product can then be pulled from the warehouse, the order can be delivered on time to the customer, and the business can be paid.
Relational database management system advantages
Organizations of all shapes and sizes employ the straightforward but effective relational model for a wide range of information requirements. Relational databases are used for many different purposes, including managing vast amounts of vital customer data, processing e-commerce transactions, and keeping track of inventories. Any information need where the data points need to be managed in a consistent, safe, rules-based manner and have a relationship to one another can be considered for a relational database.
Since the 1970s, relational databases have existed. The relational model is still the most widely used database model today because of its benefits.
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