How to Use Lookup in MongoDB Join Query - Part12 of MongoDB with C Beginners Tutorial - видео

This is a MongoDB C Lookup Tutorial. Let us see how to use Lookup in MongoDB Collection from C Application Performs a left outer join to an unsharded collection in the same database to filter in documents from the joined collection for processing. To each input document the lookup stage adds a new array field whose elements are the matching documents from the joined collection. The lookup stage passes these reshaped documents to the next stage. Local Field in Lookup: Specifies the field from the...
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