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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: "Dictionnaires hi\xE9rarchiques"
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---
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# Dictionnaires Hiérarchiques {#hierarchical-dictionaries}
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Clickhouse prend en charge les dictionnaires hiérarchiques avec un [touche numérique](external-dicts-dict-structure.md#ext_dict-numeric-key).
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Voici une structure hiérarchique:
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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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Cette hiérarchie peut être exprimée comme la table de dictionnaire suivante.
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| id\_région | région\_parent | nom\_région |
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|------------|----------------|--------------------|
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| 1 | 0 | Russie |
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| 2 | 1 | Moscou |
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| 3 | 2 | Center |
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| 4 | 0 | La Grande-Bretagne |
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| 5 | 4 | Londres |
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Ce tableau contient une colonne `parent_region` qui contient la clé du parent le plus proche de l'élément.
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Clickhouse soutient le [hiérarchique](external-dicts-dict-structure.md#hierarchical-dict-attr) propriété pour [externe dictionnaire](index.md) attribut. Cette propriété vous permet de configurer le dictionnaire hiérarchique comme décrit ci-dessus.
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Le [dictGetHierarchy](../../../sql-reference/functions/ext-dict-functions.md#dictgethierarchy) la fonction vous permet d'obtenir la chaîne parent d'un élément.
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Pour notre exemple, la structure du dictionnaire peut être la suivante:
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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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[Article Original](https://clickhouse.tech/docs/en/query_language/dicts/external_dicts_dict_hierarchical/) <!--hide-->
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