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YouTubeProgrammingKnowledge
MongoDB Tutorial 19 - MongoDB Element Operators! ($exists, $type) Easy Guide
Master two of MongoDB's most useful element operators: $exists and $type! This tutorial shows you exactly how to find documents based on whether a field exists, or based on the data type of a field. What you will learn: $exists: How to find documents that have a specific field ($exists: true), or do not have a specific field ($exists: false ...
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