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  1. 4. The structure of the database, including the tables, fields, and relationships between them.
  2. 5. In relational databases, data is organized into tables. Each table consists of rows (records) and columns (fields). For example, a table for storing customer information might have columns for customer ID, name, address, and phone number.
  3. 6. A software system that provides tools and functions for creating, managing, and manipulating databases. Examples include MySQL, PostgreSQL, Oracle, and Microsoft SQL Server.
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  1. 1. Requests to retrieve or manipulate data in the database. SQL (Structured Query Language) is commonly used to write queries for relational databases.
  2. 2. Structures that improve the speed of data retrieval operations on a database table.
  3. 3. The actual information stored in the database. This can include text, numbers, images, and other types of data.