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$switch (aggregation) — MongoDB Manual
I'm not entirely clear on what you want to do, but there are a few other examples on StackOverflow of either nested $cond (similar to a case statement) or use of multiple $cond. I think what you are after is a nested $cond , where you conditionally sum matches for $anotherField by adding another $cond comparison in the expression ... Web上一篇我们介绍了MongoDB 聚合管道的文档筛选及分组统计: $match:文档过滤 $group:文档分组,并介绍了分组中的常用操作 ... bindiff 7 download
$cond (aggregation) - Hubwiz.com
Web31 jul. 2024 · MongoDB’s document data model naturally supports JSON and its expressive query language is simple for developers to learn and use. And that makes all difference folks... Let's get numbers array data used in the javascript example to create a new document in a generic collection. WebDefinition $cond Evaluates a boolean expression to return one of the two specified return expressions. The $cond expression has one of two syntaxes: New in version 2.6. { $cond: { if: , then: , else: } } Or: { $cond: [ , , ] } WebC# 使用聚合从mongodb中的union select和order by和group by中进行选择,c#,mongodb,aggregation-framework,mongodb-.net-driver,C#,Mongodb,Aggregation Framework,Mongodb .net Driver,我试图使用C聚合框架将下一个SQL查询重写到mongodb,但我不知道如何做。 b. indicus