ClickHouse/docs/en/sql-reference/statements/detach.md

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DETACH Statement

Deletes information about the ‘name’ table from the server. The server stops knowing about the table’s existence.

DETACH TABLE [IF EXISTS] [db.]name [ON CLUSTER cluster]

This does not delete the table’s data or metadata. On the next server launch, the server will read the metadata and find out about the table again. Similarly, a “detached” table can be re-attached using the ATTACH query (with the exception of system tables, which do not have metadata stored for them).

There is no DETACH DATABASE query.