Python MongoDBLesson 129Free preview

MongoDB Query

This lesson is part of Python · All levels

Summary

This lesson covers further queries in MongoDB, from comparison operators like $gt and $gte, the $in operators for list values, to text matching with $regex. You'll also learn the projection to select which field to display. The combination of filters and projections makes data reading more efficient.

Key points

Comparison operator: $gt is greater, $gte is greater than, $lt, $lte, and $ne.
$in comparing the value against the candidate list, or $in combining some conditions.
The projection limits the returned field, _id always follows unless turned off.
The field of a constellation is written with a dot, for example {"alamat.city": "Jakarta"}.
Documents that do not have a value of a field are considered to be unsuitable for the field filter.

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