Relaatiokannan

Relaatiokanta, often referred to as a relational database, is a type of database that stores and provides access to data points that are related to one another. It is based on the relational model, an intuitive, straightforward way of representing data in tables. Each table, also known as a relation, contains rows, which represent individual records, and columns, which represent the attributes or properties of those records.

The key principle of a relational database is the establishment of relationships between different tables. These relationships are typically defined using primary keys and foreign keys. A primary key uniquely identifies each row within a table, while a foreign key in one table refers to the primary key of another table, thereby linking the two. This structured approach allows for efficient data retrieval, manipulation, and organization.

Structured Query Language (SQL) is the standard language used to interact with relational databases. SQL commands are employed to create tables, insert data, update existing data, delete data, and query for specific information. The flexibility and power of SQL, combined with the logical structure of relational databases, make them a widely adopted choice for managing diverse types of data across many applications and industries. Examples of popular relational database management systems (RDBMS) include MySQL, PostgreSQL, Oracle Database, and Microsoft SQL Server.