April 2020
Beginner to intermediate
540 pages
14h 14m
Russian
Content preview from MongoDB: полное руководство
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Запись результатов конвейера агрегации вколлекцию 241
Наконец, этот конвейер включает в себя довольно сложный этап $project.
Тем не менее все, что он действительно осуществляет, – это делает вывод
более красивым. Вместо того чтобы показывать значения rst_round или
целые документы для первого и последнего раундов, этот этап создает
сводку. Обратите внимание, что он поддерживает хорошую семантику, по-
тому что каждое значение четко обозначено. Для rst_round мы создадим
простой вложенный документ, который содержит только необходимые
данные о сумме, статье и годе, извлекая эти значения из исходного доку-
мента rst_round, который ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.