aggregation
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[MongoDB] 간단한 aggregation $lookup개발/Javascript 2022. 7. 5. 17:03
{ $lookup: { from: , localField: , foreignField: , as: } } MongoDB에서 aggregation 연산은 다음과 같이 정의합니다. Aggregation operations are expressions you can use to produce reduced and summarized results in MongoDB. MongoDB's aggregation pipeline, part of the Query API, allows you to create a pipeline that consists of one or more stages, each of which performs a specific operation on your data. 여러가지 스테이지 중에..