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52 lines
2.4 KiB
Markdown
52 lines
2.4 KiB
Markdown
---
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slug: /en/sql-reference/table-functions/deltalake
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sidebar_label: DeltaLake
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---
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# deltaLake Table Function
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Provides a read-only table-like interface to [Delta Lake](https://github.com/delta-io/delta) tables in Amazon S3.
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## Syntax
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``` sql
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deltaLake(url [,aws_access_key_id, aws_secret_access_key] [,format] [,structure] [,compression])
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```
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## Arguments
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- `url` — Bucket url with path to existing Delta Lake table in S3.
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- `aws_access_key_id`, `aws_secret_access_key` - Long-term credentials for the [AWS](https://aws.amazon.com/) account user. You can use these to authenticate your requests. These parameters are optional. If credentials are not specified, they are used from the ClickHouse configuration. For more information see [Using S3 for Data Storage](/docs/en/engines/table-engines/mergetree-family/mergetree.md/#table_engine-mergetree-s3).
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- `format` — The [format](/docs/en/interfaces/formats.md/#formats) of the file.
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- `structure` — Structure of the table. Format `'column1_name column1_type, column2_name column2_type, ...'`.
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- `compression` — Parameter is optional. Supported values: `none`, `gzip/gz`, `brotli/br`, `xz/LZMA`, `zstd/zst`. By default, compression will be autodetected by the file extension.
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**Returned value**
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A table with the specified structure for reading data in the specified Delta Lake table in S3.
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**Examples**
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Selecting rows from the table in S3 `https://clickhouse-public-datasets.s3.amazonaws.com/delta_lake/hits/`:
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``` sql
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SELECT
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URL,
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UserAgent
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FROM deltaLake('https://clickhouse-public-datasets.s3.amazonaws.com/delta_lake/hits/')
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WHERE URL IS NOT NULL
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LIMIT 2
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```
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``` response
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┌─URL───────────────────────────────────────────────────────────────────┬─UserAgent─┐
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│ http://auto.ria.ua/search/index.kz/jobinmoscow/detail/55089/hasimages │ 1 │
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│ http://auto.ria.ua/search/index.kz/jobinmoscow.ru/gosushi │ 1 │
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└───────────────────────────────────────────────────────────────────────┴───────────┘
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```
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**See Also**
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- [DeltaLake engine](/docs/en/engines/table-engines/integrations/deltalake.md)
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