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MongoDB inverse of query to return all items except specific documents?
To get documents except some specific documents, use $nor along with $and. Let us first create a collection with documents −
> db.demo1.insertOne({"StudentName":"Chris","StudentMarks":38});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e08a4f025ddae1f53b62216")
}
> db.demo1.insertOne({"StudentName":"David","StudentMarks":78});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e08a4f725ddae1f53b62217")
}
> db.demo1.insertOne({"StudentName":"Mike","StudentMarks":96});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e08a4fd25ddae1f53b62218")
}Following is the query to display all documents from a collection with the help of find() method −
> db.demo1.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e08a4f025ddae1f53b62216"),
"StudentName" : "Chris",
"StudentMarks" : 38
}
{
"_id" : ObjectId("5e08a4f725ddae1f53b62217"),
"StudentName" : "David",
"StudentMarks" : 78
}
{
"_id" : ObjectId("5e08a4fd25ddae1f53b62218"),
"StudentName" : "Mike",
"StudentMarks" : 96
}Here is the query to get inverse of query −
> db.demo1.find({$nor:[{$and:[{'StudentName':'David'},{'StudentMarks':78}]}]});This will produce the following output. The result displays Student records with marks except 78 −
{ "_id" : ObjectId("5e08a4f025ddae1f53b62216"), "StudentName" : "Chris", "StudentMarks" : 38 }
{ "_id" : ObjectId("5e08a4fd25ddae1f53b62218"), "StudentName" : "Mike", "StudentMarks" : 96 }
Updated on: 31-Mar-2020
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