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28 lines
1.2 KiB
Markdown
28 lines
1.2 KiB
Markdown
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# odbc
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Returns table that is connected via ODBC driver.
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```
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odbc(connection_settings, external_database, external_table)
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```
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**Function Parameters**
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- `connection_settings` — Name of the section with connection settings in the `odbc.ini` file.
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- `external_database` — Database in an external DBMS.
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- `external_table` — A name of the table in `external_database`.
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To implement ODBC connection, ClickHouse uses the separate program `clickhouse-odbc-bridge`. ClickHouse starts this program automatically when it is required. The ODBC bridge program is installed by the same package with the ClickHouse server.
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This function supports the [Nullable](../../data_types/nullable.md) data type (based on DDL of remote table that is queried).
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**Examples**
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```
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select * from odbc('DSN=connection_settings_name', 'external_database_name', 'external_table_name')
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```
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Some examples of how to use external dictionaries through ODBC you can find in the [ODBC](../../query_language/dicts/external_dicts_dict_sources.md#dicts-external_dicts_dict_sources-odbc) section of external dictionaries configuration.
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[Original article](https://clickhouse.yandex/docs/en/query_language/table_functions/jdbc/) <!--hide-->
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