relaatiokannoille

relaatiokannoille is a Finnish term that translates to "relational databases" in English. It refers to a type of database that stores data in a structured format using tables. These tables are organized into rows and columns, and relationships can be established between different tables. This relational model, based on the work of E. F. Codd, is the most common type of database today.

The core components of a relational database are tables, which contain records (rows) and attributes (columns). Each table represents an entity, such as customers or products, and the attributes define the characteristics of that entity. Relationships between tables are typically defined using primary keys and foreign keys. A primary key uniquely identifies a record within a table, while a foreign key in one table references the primary key in another, thereby linking related data.

Data in relational databases is accessed and manipulated using a structured query language (SQL). SQL provides a standardized way to perform operations such as querying, inserting, updating, and deleting data. The relational model emphasizes data integrity, consistency, and reduced redundancy through normalization techniques. This ensures that data is stored efficiently and accurately. Examples of popular relational database management systems (RDBMS) include MySQL, PostgreSQL, Oracle Database, and Microsoft SQL Server.