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37 lines
2.5 KiB
Markdown
37 lines
2.5 KiB
Markdown
---
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toc_folder_title: Table Functions
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toc_priority: 34
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toc_title: Introduction
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---
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# Table Functions {#table-functions}
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Table functions are methods for constructing tables.
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You can use table functions in:
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- [FROM](../statements/select.md#select-from) clause of the `SELECT` query.
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The method for creating a temporary table that is available only in the current query. The table is deleted when the query finishes.
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- [CREATE TABLE AS \<table\_function()\>](../statements/create.md#create-table-query) query.
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It's one of the methods of creating a table.
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!!! warning "Warning"
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You can’t use table functions if the [allow\_ddl](../../operations/settings/permissions_for_queries.md#settings_allow_ddl) setting is disabled.
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| Function | Description |
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|---------------|----------------------------------------------------------------------------------|
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| [file](file.md) | Creates a [File](../../engines/table_engines/special/file.md)-engine table. |
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| [merge](merge.md) | Creates a [Merge](../../engines/table_engines/special/merge.md)-engine table. |
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| [numbers](numbers.md) | Creates a table with a single column filled with integer numbers. |
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| [remote](remote.md) | Allows you to access remote servers without creating a [Distributed](../../engines/table_engines/special/distributed.md)-engine table. |
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| [url](url.md) | Creates a [Url](../../engines/table_engines/special/url.md)-engine table. |
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| [mysql](mysql.md) | Creates a [MySQL](../../engines/table_engines/integrations/mysql.md)-engine table. |
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| [jdbc](jdbc.md) | Creates a [JDBC](../../engines/table_engines/integrations/jdbc.md)-engine table. |
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| [odbc](odbc.md) | Creates a [ODBC](../../engines/table_engines/integrations/odbc.md)-engine table. |
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| [hdfs](hdfs.md) | Creates a [HDFS](../../engines/table_engines/integrations/hdfs.md)-engine table. |
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[Original article](https://clickhouse.tech/docs/en/query_language/table_functions/) <!--hide-->
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