mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-24 02:30:51 +00:00
40 lines
3.7 KiB
Markdown
40 lines
3.7 KiB
Markdown
---
|
||
toc_folder_title: Table Functions
|
||
toc_priority: 34
|
||
toc_title: Introduction
|
||
---
|
||
|
||
# Table Functions {#table-functions}
|
||
|
||
Table functions are methods for constructing tables.
|
||
|
||
You can use table functions in:
|
||
|
||
- [FROM](../../sql-reference/statements/select/from.md) clause of the `SELECT` query.
|
||
|
||
The method for creating a temporary table that is available only in the current query. The table is deleted when the query finishes.
|
||
|
||
- [CREATE TABLE AS table_function()](../../sql-reference/statements/create/table.md) query.
|
||
|
||
It's one of the methods of creating a table.
|
||
|
||
!!! 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](../../sql-reference/table-functions/file.md) | Creates a [File](../../engines/table-engines/special/file.md)-engine table. |
|
||
| [merge](../../sql-reference/table-functions/merge.md) | Creates a [Merge](../../engines/table-engines/special/merge.md)-engine table. |
|
||
| [numbers](../../sql-reference/table-functions/numbers.md) | Creates a table with a single column filled with integer numbers. |
|
||
| [remote](../../sql-reference/table-functions/remote.md) | Allows you to access remote servers without creating a [Distributed](../../engines/table-engines/special/distributed.md)-engine table. |
|
||
| [url](../../sql-reference/table-functions/url.md) | Creates a [Url](../../engines/table-engines/special/url.md)-engine table. |
|
||
| [mysql](../../sql-reference/table-functions/mysql.md) | Creates a [MySQL](../../engines/table-engines/integrations/mysql.md)-engine table. |
|
||
| [postgresql](../../sql-reference/table-functions/postgresql.md) | Creates a [PostgreSQL](../../engines/table-engines/integrations/postgresql.md)-engine table. |
|
||
| [jdbc](../../sql-reference/table-functions/jdbc.md) | Creates a [JDBC](../../engines/table-engines/integrations/jdbc.md)-engine table. |
|
||
| [odbc](../../sql-reference/table-functions/odbc.md) | Creates a [ODBC](../../engines/table-engines/integrations/odbc.md)-engine table. |
|
||
| [hdfs](../../sql-reference/table-functions/hdfs.md) | Creates a [HDFS](../../engines/table-engines/integrations/hdfs.md)-engine table. |
|
||
| [s3](../../sql-reference/table-functions/s3.md) | Creates a [S3](../../engines/table-engines/integrations/s3.md)-engine table. |
|
||
| [sqlite](../../sql-reference/table-functions/sqlite.md) | Creates a [sqlite](../../engines/table-engines/integrations/sqlite.md)-engine table. |
|
||
|
||
[Original article](https://clickhouse.com/docs/en/sql-reference/table-functions/) <!--hide-->
|