mongoDB 구조
SQL Terms/ConceptsMongoDB Terms/Conceptsdatabasedatabasetablecollectionrowdocument or BSON documentcolumnfieldindexindextable joinsembedded documents and linking primary key
Specify any unique column or column combination as primary key.
In MongoDB, the primary key is automatically set to the _idfield. aggregation (e.g. group by) aggregation framework
See the SQL to Aggregation Framework Mapping Chart.
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