What is a Database Query?

People create a database because they want to organize the data in such a way that they can glean useful information from it. These data can be accessed by using a query. A query, if properly stated, will extract data from the database. For example, a businessman creates a database which contains the list of his products, their prices, and the number of people who bought them. If he wants to find out which products are most expensive, he can input a query into the [...]