aggregation-framework
Get n-th element of an array in MongoDB
As part of my document in MongoDB I\'m storing an array of objects. How can I query it for only the 4th element of the array for exampl开发者_如何学运维e? So I don\'t want the get the entire array out[详细]
2023-03-31 14:09 分类：问答MongoDB: Combine data from multiple collections into one..how?
How can I (in MongoDB) combine data from multiple collections into one collection? Can I use map-reduce an开发者_开发知识库d if so then how?[详细]
2023-02-25 16:56 分类：问答Update MongoDB field using value of another field
In MongoDB, is it possible to update the value of a field using the value from another field?The equivalent SQL would be something like:[详细]
2023-01-21 01:42 分类：问答Return actual type of a field in MongoDB
In MongoDB, using $type, it is possible to filter a search based on if the field matches a BSON data type (see DOCS).[详细]
2023-01-06 08:03 分类：问答MongoDB Regex Search on Integer Value
I want to regex search an integer value in MongoDB. Is this possible? I\'m buil开发者_如何学编程ding a CRUD type interface that allows * for wildcards on the various fields. I\'m trying to keep the U[详细]
2023-01-01 13:35 分类：问答Is there any aggregation function to get weekday or month as string in mongodb?
Basically I want to get weekday and month values as string in mongodb, I found $dayOfWeek and $month functions under $project and they return integer values, how can I convert these integers to string[详细]
2022-12-07 17:43 分类：问答
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