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Remove document whose value is matched with $eq from a MongoDB collection?
Remove document using remove(), whose value is matched with $eq from a MongoDB collection. The $eq operator matches documents where the value of a field equals the specified value.
Let us create a collection with documents −
> db.demo626.insertOne({id:1,"Name":"Chris"}); { "acknowledged" : true, "insertedId" : ObjectId("5e9ac6376c954c74be91e6ae") } > db.demo626.insertOne({id:2,"Name":"David"}); { "acknowledged" : true, "insertedId" : ObjectId("5e9ac63e6c954c74be91e6af") } > db.demo626.insertOne({id:3,"Name":"Bob"}); { "acknowledged" : true, "insertedId" : ObjectId("5e9ac6436c954c74be91e6b0") } > db.demo626.insertOne({id:4,"Name":"Mike"}); { "acknowledged" : true, "insertedId" : ObjectId("5e9ac6486c954c74be91e6b1") }
Display all documents from a collection with the help of find() method −
> db.demo626.find();
This will produce the following output −
{ "_id" : ObjectId("5e9ac6376c954c74be91e6ae"), "id" : 1, "Name" : "Chris" } { "_id" : ObjectId("5e9ac63e6c954c74be91e6af"), "id" : 2, "Name" : "David" } { "_id" : ObjectId("5e9ac6436c954c74be91e6b0"), "id" : 3, "Name" : "Bob" } { "_id" : ObjectId("5e9ac6486c954c74be91e6b1"), "id" : 4, "Name" : "Mike" }
Following is the query to remove document from collection −
> db.demo626.remove({Name:{$eq:"Bob"}}); WriteResult({ "nRemoved" : 1 })
Display all documents from a collection with the help of find() method −
> db.demo626.find();
This will produce the following output −
{ "_id" : ObjectId("5e9ac6376c954c74be91e6ae"), "id" : 1, "Name" : "Chris" } { "_id" : ObjectId("5e9ac63e6c954c74be91e6af"), "id" : 2, "Name" : "David" } { "_id" : ObjectId("5e9ac6486c954c74be91e6b1"), "id" : 4, "Name" : "Mike" }
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