ClickHouse/docs/en/query_language/table_functions/index.md

# Table Functions

Table function is a method of constructing a table.

You can use table functions in:

* [CREATE TABLE AS <table_function()>](../create.md#create-table-query) query.

    It's one of the methods of creating a table.

* [FROM](../select.md#select-from) clause of the `SELECT` query.

    The method of creating a temporary table, that is available only in current query. The table is deleted after the query finishes.

!!! warning "Warning"
    You can't use table functions if the [allow_ddl](../../operations/settings/permissions_for_queries.md#settings_allow_ddl) setting is disabled.

Function | Description
---------|------------
[file](file.md) | Creates a [File](../../operations/table_engines/file.md)-engine table.
[merge](merge.md) | Creates a [Merge](../../operations/table_engines/merge.md)-engine table.
[numbers](numbers.md) | Creates a table with the single column filled with integer numbers.
[remote](remote.md) | Allows you to access remote servers without creating a [Distributed](../../operations/table_engines/distributed.md)-engine table.
[url](url.md) | Creates a [Url](../../operations/table_engines/url.md)-engine table.
[mysql](mysql.md) | Creates a [MySQL](../../operations/table_engines/mysql.md)-engine table.
[jdbc](jdbc.md) | Creates a [JDBC](../../operations/table_engines/jdbc.md)-engine table.
[odbc](odbc.md) | Creates a [ODBC](../../operations/table_engines/odbc.md)-engine table.
[hdfs](hdfs.md) | Creates a [HDFS](../../operations/table_engines/hdfs.md)-engine table.

[Original article](https://clickhouse.yandex/docs/en/query_language/table_functions/) <!--hide-->
DOCAPI-7743: CREATE TABLE AS table_function() docs. (#6887) * Typo fix. * DOCAPI-7743: Update of docs around table functions. * DOCAPI-7743: More changes * DOCAPI-7743: more fixes. * DOCAPI-7743: CREATE TABLE * Update docs/en/query_language/table_functions/index.md Co-Authored-By: Ivan Blinkov <github@blinkov.ru> * DOCAPI-7743: Fixes. 2019-09-12 14:14:19 +00:00			`# Table Functions`
Initial commit if EN docs 2017-04-03 19:49:50 +00:00
DOCAPI-7743: CREATE TABLE AS table_function() docs. (#6887) * Typo fix. * DOCAPI-7743: Update of docs around table functions. * DOCAPI-7743: More changes * DOCAPI-7743: more fixes. * DOCAPI-7743: CREATE TABLE * Update docs/en/query_language/table_functions/index.md Co-Authored-By: Ivan Blinkov <github@blinkov.ru> * DOCAPI-7743: Fixes. 2019-09-12 14:14:19 +00:00			`Table function is a method of constructing a table.`
Initial commit if EN docs 2017-04-03 19:49:50 +00:00
DOCAPI-7743: CREATE TABLE AS table_function() docs. (#6887) * Typo fix. * DOCAPI-7743: Update of docs around table functions. * DOCAPI-7743: More changes * DOCAPI-7743: more fixes. * DOCAPI-7743: CREATE TABLE * Update docs/en/query_language/table_functions/index.md Co-Authored-By: Ivan Blinkov <github@blinkov.ru> * DOCAPI-7743: Fixes. 2019-09-12 14:14:19 +00:00			`You can use table functions in:`

			`* [CREATE TABLE AS <table_function()>](../create.md#create-table-query) query.`

			`It's one of the methods of creating a table.`

			* [FROM](../select.md#select-from) clause of the `SELECT` query.

			`The method of creating a temporary table, that is available only in current query. The table is deleted after the query finishes.`

			`!!! warning "Warning"`
			`You can't use table functions if the [allow_ddl](../../operations/settings/permissions_for_queries.md#settings_allow_ddl) setting is disabled.`

			`Function \| Description`
			`---------\|------------`
			`[file](file.md) \| Creates a [File](../../operations/table_engines/file.md)-engine table.`
			`[merge](merge.md) \| Creates a [Merge](../../operations/table_engines/merge.md)-engine table.`
			`[numbers](numbers.md) \| Creates a table with the single column filled with integer numbers.`
			`[remote](remote.md) \| Allows you to access remote servers without creating a [Distributed](../../operations/table_engines/distributed.md)-engine table.`
			`[url](url.md) \| Creates a [Url](../../operations/table_engines/url.md)-engine table.`
			`[mysql](mysql.md) \| Creates a [MySQL](../../operations/table_engines/mysql.md)-engine table.`
			`[jdbc](jdbc.md) \| Creates a [JDBC](../../operations/table_engines/jdbc.md)-engine table.`
			`[odbc](odbc.md) \| Creates a [ODBC](../../operations/table_engines/odbc.md)-engine table.`
			`[hdfs](hdfs.md) \| Creates a [HDFS](../../operations/table_engines/hdfs.md)-engine table.`
WIP on docs/website (#3383) * CLICKHOUSE-4063: less manual html @ index.md * CLICKHOUSE-4063: recommend markdown="1" in README.md * CLICKHOUSE-4003: manually purge custom.css for now * CLICKHOUSE-4064: expand <details> before any print (including to pdf) * CLICKHOUSE-3927: rearrange interfaces/formats.md a bit * CLICKHOUSE-3306: add few http headers * Remove copy-paste introduced in #3392 * Hopefully better chinese fonts #3392 * get rid of tabs @ custom.css * Apply comments and patch from #3384 * Add jdbc.md to ToC and some translation, though it still looks badly incomplete * minor punctuation * Add some backlinks to official website from mirrors that just blindly take markdown sources * Do not make fonts extra light * find . -name '.md' -type f \| xargs -I{} perl -pi -e 's//g' {} find . -name '.md' -type f \| xargs -I{} perl -pi -e 's/ sql/g' {} Remove outdated stuff from roadmap.md * Not so light font on front page too * Refactor Chinese formats.md to match recent changes in other languages 2018-10-16 10:47:17 +00:00
			`[Original article](https://clickhouse.yandex/docs/en/query_language/table_functions/) <!--hide-->`