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1008 B
Markdown
12 lines
1008 B
Markdown
# Словари
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Словарь — это отображение (`ключ -> атрибуты`), которое удобно использовать для различного вида справочников.
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ClickHouse поддерживает специальные функции для работы со словарями, которые можно использовать в запросах. Проще и эффективнее использовать словари с помощью функций, чем `JOIN` с таблицами-справочниками.
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ClickHouse поддерживает:
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- [Встроенные словари](internal_dicts.md#internal_dicts) со специфическим [набором функций](../functions/ym_dict_functions.md#ym_dict_functions).
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- [Подключаемые (внешние) словари](external_dicts.md#dicts-external_dicts) с [набором функций](../functions/ext_dict_functions.md#ext_dict_functions).
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