Database IntegrationLesson 64Free preview

MongoDB Query

This lesson is part of Node.js · All levels

Summary

This lesson deepens the ability to filter MongoDB data with query operators like $gt, $lt, $in, and $or. You're going to blend a few conditions into one filter for a precision query. These operators make MongoDB flexible even without the formal SQL language.

Key points

The base filter {field: value} means the column is equal to the value.
The comparison operator: $eq, $ne, $gt, $gte, $lt, $lte.
$in and $nin select values from a particular list.
$or, $and, $not combines some logical conditions.
Queries are nested using dot notation, e.g. {'spec.weight': {$gt: 1}}.

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