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* split up select.md * array-join.md basic refactoring * distinct.md basic refactoring * format.md basic refactoring * from.md basic refactoring * group-by.md basic refactoring * having.md basic refactoring * additional index.md refactoring * into-outfile.md basic refactoring * join.md basic refactoring * limit.md basic refactoring * limit-by.md basic refactoring * order-by.md basic refactoring * prewhere.md basic refactoring * adjust operators/index.md links * adjust sample.md links * adjust more links * adjust operatots links * fix some links * adjust aggregate function article titles * basic refactor of remaining select clauses * absolute paths in make_links.sh * run make_links.sh * remove old select.md locations * translate docs/es * translate docs/fr * translate docs/fa * remove old operators.md location * change operators.md links * adjust links in docs/es * adjust links in docs/es * minor texts adjustments * wip * update machine translations to use new links * fix changelog * es build fixes * get rid of some select.md links * temporary adjust ru links * temporary adjust more ru links * improve curly brace handling * adjust ru as well * fa build fix * ru link fixes * zh link fixes * temporary disable part of anchor checks
71 lines
2.2 KiB
Markdown
71 lines
2.2 KiB
Markdown
---
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machine_translated: true
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machine_translated_rev: 72537a2d527c63c07aa5d2361a8829f3895cf2bd
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toc_priority: 45
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toc_title: "Diccionarios jer\xE1rquicos"
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---
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# Diccionarios jerárquicos {#hierarchical-dictionaries}
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ClickHouse soporta diccionarios jerárquicos con un [llave numérica](external-dicts-dict-structure.md#ext_dict-numeric-key).
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Mira la siguiente estructura jerárquica:
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``` text
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0 (Common parent)
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│
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├── 1 (Russia)
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│ │
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│ └── 2 (Moscow)
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│ │
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│ └── 3 (Center)
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│
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└── 4 (Great Britain)
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│
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└── 5 (London)
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```
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Esta jerarquía se puede expresar como la siguiente tabla de diccionario.
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| region\_id | parent\_region | nombre\_región |
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|------------|----------------|----------------|
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| 1 | 0 | Rusia |
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| 2 | 1 | Moscu |
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| 3 | 2 | Centrar |
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| 4 | 0 | Gran Bretaña |
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| 5 | 4 | Londres |
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Esta tabla contiene una columna `parent_region` que contiene la clave del padre más cercano para el elemento.
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ClickHouse soporta el [jerárquica](external-dicts-dict-structure.md#hierarchical-dict-attr) propiedad para [diccionario externo](index.md) atributo. Esta propiedad le permite configurar el diccionario jerárquico similar al descrito anteriormente.
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El [dictGetHierarchy](../../../sql-reference/functions/ext-dict-functions.md#dictgethierarchy) función le permite obtener la cadena principal de un elemento.
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Para nuestro ejemplo, la estructura del diccionario puede ser la siguiente:
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``` xml
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<dictionary>
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<structure>
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<id>
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<name>region_id</name>
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</id>
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<attribute>
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<name>parent_region</name>
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<type>UInt64</type>
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<null_value>0</null_value>
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<hierarchical>true</hierarchical>
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</attribute>
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<attribute>
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<name>region_name</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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```
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[Artículo Original](https://clickhouse.tech/docs/en/query_language/dicts/external_dicts_dict_hierarchical/) <!--hide-->
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