Can ClickHouse be classified as a NoSQL data storage system?

ClickHouse cannot be classified as a traditional NoSQL system. It is a columnar analytical database designed for fast analysis of large volumes of data.

Main characteristics of ClickHouse:

• Uses an SQL-like query language.
• Stores data in a columnar format for efficient aggregation and analytics.
• Intended for OLAP tasks (analytical processing).

NoSQL systems are usually characterized by the absence of a fixed schema, support for documents, key-value, graphs, or wide columns, and often do not use SQL.

ClickHouse is closer to traditional analytical DBMSs than to NoSQL, although it has some features that distinguish it from traditional relational databases.