Aggregation Instructions
데이터 집계 명령어
- Aggregation Operation은 여러 조건을 이용해 집합을 생성하고,
그 집합 중 필요한 값을 구하는 데 사용되는 연산을 의미한다.
- RDB의 Group By와 유사하다.
Aggregation Methods
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Name
|
Description
|
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Provides access to the aggregation pipeline.
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|
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Performs map-reduce aggregation for large data sets.
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\(\texttt{aggregate}\) Instruction Prototype
db.<collection_name>.aggregate(pipeline, options)
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Parameter
|
Type
|
Description
|
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pipeline
(Mandatory) |
array
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A sequence of data aggregation operations or stages.
aggregation pipeline operators 에서 보다 자세한 사항을 확인할 수 있다. The method can still accept the pipeline stages as separate arguments instead of as elements in an array; however, if you do not specify the pipeline as an array, you cannot specify the options parameter. |
|
options
(Optional) |
document
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Optional. Additional options that aggregate() passes to the aggregate command. Available only if you specify the pipeline as an array.
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Reference: MongoDB Documentation (URL)
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