MongoDB TutorialLesson 11Free preview

MongoDB Update Operators

This lesson is part of MongoDB · All levels

Summary

This lesson introduces the MongoDB update operator that modifies a portion of a document without replacing it entirely. In addition to $set, there are $unset to delete fields, $inc to add values, $push and $pull to manage arrays, and $rename to change field names. The use of the operator keeps the other data intact as the update takes place.

Key points

$set changes the value, $unset removes the field, and $inc adds the number
Adding elements to arrays, pulling out the matching elements
$rename replaces a field name
The update operator can be combined in one command

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