Relaatiomallilla

Relaatiomallilla refers to a relational model, a fundamental concept in database management. It is a way of organizing data into tables, where each table represents an entity and each row in the table represents an instance of that entity. The columns in the table represent the attributes of the entity. Relationships between different tables are established through the use of keys, specifically primary keys and foreign keys. A primary key uniquely identifies each record within a table, while a foreign key in one table refers to the primary key in another table, thus linking the two. This structured approach allows for efficient data storage, retrieval, and manipulation, minimizing redundancy and ensuring data integrity. The relational model was first proposed by Edgar F. Codd in 1970 and has become the dominant model for database systems, forming the basis for SQL (Structured Query Language). Examples of relational database management systems (RDBMS) include MySQL, PostgreSQL, and Oracle Database. The principles of the relational model are crucial for understanding how modern databases function and are designed.