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alternate:
  - https://ydb.tech/docs/en/yql/reference/types.md
  - https://ydb.tech/docs/ru/yql/reference/types.md
  - href: en/yql/reference/types/index.md
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> **Documentation Index:** Fetch the complete configuration index at https://ydb.tech/docs/en/llms.txt

# YQL data types

This section contains articles on YQL data types:

- [Simple/Primitive types](https://ydb.tech/docs/en/yql/reference/types/primitive.md)
- [Serial types](https://ydb.tech/docs/en/yql/reference/types/serial.md)
- [Optional types](https://ydb.tech/docs/en/yql/reference/types/optional.md)
- [Containers](https://ydb.tech/docs/en/yql/reference/types/containers.md)
- [Special types](https://ydb.tech/docs/en/yql/reference/types/special.md)
- [Type casting](https://ydb.tech/docs/en/yql/reference/types/cast.md)
- [Text representation of data types](https://ydb.tech/docs/en/yql/reference/types/type_string.md)
- [Data representation in JSON format](https://ydb.tech/docs/en/yql/reference/types/json.md)