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ClickHouse/docs/ru/data_types/special_data_types/nothing.md
BayoNet 2d2bc052e1
DOCAPI-8530: Code blocks markup fix (#7060) 
* Typo fix.

* Links fix.

* Fixed links in docs.

* More fixes.

* docs/en: cleaning some files

* docs/en: cleaning data_types

* docs/en: cleaning database_engines

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* docs/en: cleaning getting_started

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* docs/ru: cleaning index

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* docs/ru: cleaning development

* docs/ru: cleaning general

* docs/ru: cleaning getting_started

* docs/ru: cleaning interfaces

* docs/ru: cleaning operations

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* Update docs/en/data_types/array.md

decorated ```

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* Update docs/en/getting_started/example_datasets/nyc_taxi.md

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* Update docs/en/interfaces/formats.md

fixed error

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* docs: fixed error

* docs: fixed error
2019-09-23 18:31:46 +03:00

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Nothing

Этот тип данных предназначен только для того, чтобы представлять NULL, т.е. отсутствие значения.

Невозможно создать значение типа Nothing, поэтому он используется там, где значение не подразумевается. Например, NULL записывается как Nullable(Nothing) (Nullable — это тип данных, позволяющий хранить NULL в таблицах). Также тип Nothing используется для обозначения пустых массивов:

SELECT toTypeName(Array())

┌─toTypeName(array())─┐
│ Array(Nothing)      │
└─────────────────────┘

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