NoSQL is a term used to refer to several types of databases that store data differently from traditional relational databases. For this reason, they are also called non-relational databases.
NoSQL
Not Only SQL
Key differences between SQL and NoSQL databases
| SQL databases | NoSQL databases | |
|---|---|---|
| Data schema | Data is stored in tables with a strictly predefined structure and data types | There are no strict constraints on the data structure |
| Query language | A standardized language is used to work with data — SQL | Each database has its own query language specific to that particular system |
| Data model | Tables with rows and columns. Relationships between tables are established using foreign keys | Various data models, such as key-value, column-family, document, and graph |
| Examples | PostgreSQL, Oracle, MySQL, SQL Server | MongoDB, Cassandra, Redis, Neo4j |
NoSQL databases are flexible and less standardized compared to traditional relational databases. Each NoSQL database can have its own features, advantages, and drawbacks depending on its specific implementation.
Task
Уровень повышен!
