ClickHouse/docs/en/operations/system-tables/one.md

# system.one {#system-one}

This table contains a single row with a single `dummy` UInt8 column containing the value 0.

This table is used if a `SELECT` query doesn’t specify the `FROM` clause.

This is similar to the `DUAL` table found in other DBMSs.

[Original article](https://clickhouse.tech/docs/en/operations/system_tables/one) <!--hide-->
-												[docs] split aggregate function and system table references (#11742)

* prefer relative links from root

* wip

* split aggregate function reference

* split system tables
											
										
										
											2020-06-18 08:24:31 +00:00
+								# system.one {#system-one}
 								This table contains a single row with a single `dummy` UInt8 column containing the value 0.
 								This table is used if a `SELECT` query doesn’t specify the `FROM` clause.
 								This is similar to the `DUAL` table found in other DBMSs.
-												DOCSUP-1915: Split system-table.md into separate files. (#13160)

* Corrected en files

* Split system-tables.md into separate files

* Fixed links.

* Fixed links.

* Fixed links.

* Fixed links.

* Add ref to original article

* Fixed links

* Add toc_folder_title and translate

* Add stack_trace.md, correct toc-title

* Fixed links

* Hypothesis testing

* Hypothesis testing

* Update run.sh, thanks @azat

Co-authored-by: Anna Devyatova <annadevyatova@yandex-team.ru>
Co-authored-by: Sergei Shtykov <bayonet@yandex-team.ru>
Co-authored-by: alexey-milovidov <milovidov@yandex-team.ru>
											
										
										
											2020-08-06 08:50:29 +00:00
 								[Original article](https://clickhouse.tech/docs/en/operations/system_tables/one) <!--hide-->