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91 lines
2.8 KiB
Markdown
91 lines
2.8 KiB
Markdown
# Diccionario {#dictionary}
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El `Dictionary` el motor muestra el [diccionario](../../query_language/dicts/external_dicts.md) datos como una tabla ClickHouse.
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Como ejemplo, considere un diccionario de `products` con la siguiente configuración:
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``` xml
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<dictionaries>
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<dictionary>
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<name>products</name>
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<source>
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<odbc>
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<table>products</table>
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<connection_string>DSN=some-db-server</connection_string>
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</odbc>
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</source>
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<lifetime>
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<min>300</min>
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<max>360</max>
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</lifetime>
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<layout>
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<flat/>
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</layout>
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<structure>
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<id>
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<name>product_id</name>
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</id>
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<attribute>
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<name>title</name>
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<type>String</type>
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<null_value></null_value>
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</attribute>
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</structure>
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</dictionary>
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</dictionaries>
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```
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Consultar los datos del diccionario:
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``` sql
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SELECT
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name,
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type,
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key,
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attribute.names,
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attribute.types,
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bytes_allocated,
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element_count,
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source
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FROM system.dictionaries
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WHERE name = 'products'
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```
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``` text
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┌─name─────┬─type─┬─key────┬─attribute.names─┬─attribute.types─┬─bytes_allocated─┬─element_count─┬─source──────────┐
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│ products │ Flat │ UInt64 │ ['title'] │ ['String'] │ 23065376 │ 175032 │ ODBC: .products │
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└──────────┴──────┴────────┴─────────────────┴─────────────────┴─────────────────┴───────────────┴─────────────────┘
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```
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Puede usar el [dictGet\*](../../query_language/functions/ext_dict_functions.md#ext_dict_functions) función para obtener los datos del diccionario en este formato.
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Esta vista no es útil cuando necesita obtener datos sin procesar o cuando `JOIN` operación. Para estos casos, puede usar el `Dictionary` motor, que muestra los datos del diccionario en una tabla.
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Sintaxis:
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``` sql
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CREATE TABLE %table_name% (%fields%) engine = Dictionary(%dictionary_name%)`
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```
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Ejemplo de uso:
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``` sql
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create table products (product_id UInt64, title String) Engine = Dictionary(products);
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```
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Ok
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Echa un vistazo a lo que hay en la mesa.
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``` sql
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select * from products limit 1;
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```
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``` text
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┌────product_id─┬─title───────────┐
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│ 152689 │ Some item │
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└───────────────┴─────────────────┘
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```
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[Artículo Original](https://clickhouse.tech/docs/es/operations/table_engines/dictionary/) <!--hide-->
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