Use $ne (for "not equal") db.collection.find({ "fieldToCheck": { $exists: true, $ne: null } }). ... <看更多>

Exists Method. Tests that an element of that name exists (see $exists). Namespace: MongoDB.Driver.Builders ... <看更多>

I see similar results when tried on MongoDB v4.2.8 - using the posted info. In general, the $exists in a query filter uses the index on that field. ... <看更多>

mongodb index and exists. GitHub Gist: instantly share code, notes, and snippets. ... <看更多>

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I have tried to use mongoose and mongojs to retrive data from mongodb. Even tried with passing right collection name in schema. Here is my code. using mongoose( ... ... <看更多>