July 2023
Intermediate to advanced
278 pages
5h 40m
Chinese
Content preview from Trino 权威指南：原书第2版
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128
|
第
7
章
7.7 ETL
和联邦查询
ETL
（
Extract
、
Transform
、
Load
，提取、转换、加载）是一个术语，指从数据源复制数
据并将其放入另一个数据源的技术。通常在准备目标数据的过程中会有一个从数据源转
换数据的中间步骤。这个过程可能包括丢弃列、进行计算、过滤和清洗数据、
Join
数据，
以及进行预聚合等，这些都是为了让目标数据更适合查询。在一些用例中，
ETL
的顺序
会改变，变成
ELT
，虽然存在差异，但
Trino
适用于这两种顺序。
Trino
并不是一个可以与商业解决方案相媲美的、成熟的
ETL
工具，但它可以通过避
免
ETL
来提供一些帮助。因为
Trino
可以从数据源查询，所以可能不再需要移动数据。
Trino
可以在数据所在的地方查询数据，以降低管理
ETL
过程的复杂性。
你可能仍需要做某些类型的
ETL
转换。也许你想查询预聚合的数据，或者你不想给底层
系统增加更多的负载。通过使用
CREATE TABLE AS
或
INSERT SELECT
结构，你可以将数
据从一个数据源移动到另一个数据源。
Trino
适用于多种场景，可以作为由其他工具编排的
ETL
工作负载的查询处理和执行
引擎。
将
Trino
用于
ETL
工作负载和用例的一大优势是支持关系型数据库之外的其他数据源。
支持查询容错将
Trino
提升为
ETL
用例的一流查询引擎，并结合现代数据仓库设置。
与许多其他
ETL
解决方案相比，
Trino
具有性能优势，并集成了
dbt
、
Apache Flink
和
Apache Airflow
等现代数据流水线工具，因此
Trino ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.