Database Terminology
Essential SQL Concepts for Beginners Understanding key database terminology is critical for anyone learning SQL or managing relational databases. This guide covers all the foundational terms and concepts used in SQL—from database design to everyday operations. What is a Database? A database is an organized collection of structured data stored electronically. In SQL, data is arranged into tables that allow efficient retrieval, manipulation, and updating. Key Database Terms 1. Table The basic unit for storing data; a table organizes data into rows and columns. Example: A “Customers” table contains columns like Name, Email, Phone. 2. Row and Column Row: A single record in a table (also called a tuple). Column: Defines a field or attribute of each record (e.g., “Email”). 3. Primary Key A column (or set of columns) that uniquely identifies each row in a table. Example: CustomerID in the Customers table. 4. Foreign Key A column that creates a link between two...