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71 lines
2.1 KiB
Markdown
71 lines
2.1 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: "Hiyerar\u015Fik s\xF6zl\xFCkler"
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---
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# Hiyerarşik Sözlükler {#hierarchical-dictionaries}
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ClickHouse bir hiyerarşik sözlükler destekler [sayısal tuş](external-dicts-dict-structure.md#ext_dict-numeric-key).
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Aşağıdaki hiyerarşik yapıya bakın:
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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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Bu hiyerarşi aşağıdaki sözlük tablosu olarak ifade edilebilir.
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| region\_id | parent\_region | region\_name |
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|------------|----------------|--------------|
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| 1 | 0 | Rusya |
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| 2 | 1 | Moskova |
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| 3 | 2 | Merkezli |
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| 4 | 0 | İngiltere |
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| 5 | 4 | Londra |
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Bu tablo bir sütun içerir `parent_region` bu öğe için en yakın ebeveynin anahtarını içerir.
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ClickHouse destekler [hiyerarşik](external-dicts-dict-structure.md#hierarchical-dict-attr) için mülkiyet [dış sözlük](index.md) öznitelik. Bu özellik, yukarıda açıklanana benzer hiyerarşik sözlüğü yapılandırmanıza izin verir.
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Bu [dictGetHierarchy](../../../sql-reference/functions/ext-dict-functions.md#dictgethierarchy) fonksiyonu bir elemanın üst zincir almak için izin verir.
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Örneğimiz için, sözlüğün yapısı aşağıdaki gibi olabilir:
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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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[Orijinal makale](https://clickhouse.tech/docs/en/query_language/dicts/external_dicts_dict_hierarchical/) <!--hide-->
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