ClickHouse/docs/en/engines/table-engines/special/null.md

sidebar_position	sidebar_label
50	Null

Null Table Engine

When writing to a Null table, data is ignored. When reading from a Null table, the response is empty.

:::note If you are wondering why this is useful, note that you can create a materialized view on a Null table. So the data written to the table will end up affecting the view, but original raw data will still be discarded. :::