MongoDB Element Query Operators Example

Date: 2018-02-22

This tutorial explains MongoDB's element query operators, specifically $exists and $type. $exists retrieves documents where a specified field exists (or doesn't exist), demonstrated by finding documents with and without a "retirement_date" field. $type retrieves documents based on a field's data type (e.g., string, double), illustrated by selecting documents with specific zip code types. Examples using these operators with the editors collection in a warehouse database are provided. The tutorial also covers using the pretty() method for structured output.

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