[MongoDB University] 정리

파이프라인 : $match(일치모양골라내기) -> $project(형태변형) -> $group(단일파일로만들어전체에대한비율계산) Stages cannot be configured to produce our desired output. This is definitely not correct. Stages can be configured in almost any way we desire. Pipelines must consist of at least two stages. This is not correct. Pipelines must consist of at least one stage, and can have many stages. Documents flow through the pipeline, pass..

2021.02.01