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Is there a way to execute a single query for multiple, distinct ranges of documents in MongoDB?
e.g.
!(x > 10 && x < 20) && !(x > 25 && x < 30), where x is some field.
209
MongoDB provides the find() that is used to find multiple values or documents from the collection. The find() method returns a cursor of the result set and prints all the documents. To find the multiple values, we can use the aggregation operations that are provided by MongoDB itself.
Definition. $elemMatch. The $elemMatch operator matches documents that contain an array field with at least one element that matches all the specified query criteria.
What is the Aggregation Pipeline in MongoDB? The aggregation pipeline refers to a specific flow of operations that processes, transforms, and returns results. In a pipeline, successive operations are informed by the previous result. Let's take a typical pipeline: Input -> $match -> $group -> $sort -> output.
ISODate("2012-12-19T06:01:17.171Z") ISODate() is a helper function that's built into to MongoDB and wraps the native JavaScript Date object. When you use the ISODate() constructor from the Mongo shell, it actually returns a JavaScript Date object.
You can construct that query using $or with the $gte and $lte operators by inverting the boolean expression:
db.coll.find({
$or: [{x: {$lte: 10}}, {x: {$gte: 20, $lte: 25}}, {x: {$gte: 30}}]
})
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