> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-fix-nav-issues.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> Overview of special data types in ClickHouse that are used for intermediate results during query execution

# Special Data Types

Special data type values can't be serialized for saving in a table or output in query results, but can be used as an intermediate result during query execution.