SQL is a language for managing relational databases from "summary" of SQL and Relational Theory by C. Date
SQL is indeed a language, but it's not a general-purpose language like C++ or Java. Rather, it's a special-purpose language, specifically designed for managing relational databases. In practice, what that means is that SQL is used to define and manipulate tables in those databases, and also to access the data stored in those tables. The term relational database refers to a collection of tables, where each table is a two-dimensional structure, somewhat like a spreadsheet. Each table consists of rows and columns, with each row representing a single entity of interest (such as an employee or a product), and each column representing an attribute of that entity (such as the employee's name or the product's price). But what exactly does it mean to manage a relational database? Well, that's a rather broad and somewhat vague concept. At a high level, it includes such tasks as creating and maintaining tables, inserting new data into those tables, updating existing data, and deleting unwanted data. It also includes queries, which essentially means extracting specific...
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