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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
23 lines
922 B
Markdown
23 lines
922 B
Markdown
---
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machine_translated: true
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machine_translated_rev: 72537a2d527c63c07aa5d2361a8829f3895cf2bd
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toc_folder_title: "\u5B57\u5178"
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toc_priority: 35
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toc_title: "\u5BFC\u8A00"
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---
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# 字典 {#dictionaries}
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字典是一个映射 (`key -> attributes`）这是方便各种类型的参考清单。
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ClickHouse支持使用可用于查询的字典的特殊功能。 这是更容易和更有效地使用字典与功能比 `JOIN` 与参考表。
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[NULL](../../sql-reference/syntax.md#null-literal) 值不能存储在字典中。
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ClickHouse支持:
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- [内置字典](internal-dicts.md#internal_dicts) 具有特定的 [功能集](../../sql-reference/functions/ym-dict-functions.md).
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- [插件（外部）字典](external-dictionaries/external-dicts.md#dicts-external-dicts) 用一个 [功能集](../../sql-reference/functions/ext-dict-functions.md).
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[原始文章](https://clickhouse.tech/docs/en/query_language/dicts/) <!--hide-->
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