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How to query with nand operator in MongoDB?
The $not operator won’t invert a complex expression. Therefore, use $and or $or with $ne operator.
Let us create a collection with documents −
> db.demo266.insertOne({"active1":true,"active2":false});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e480f4b1627c0c63e7dbaa7")
}
> db.demo266.insertOne({"active1":true,"active2":true});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e480f501627c0c63e7dbaa8")
}
> db.demo266.insertOne({"active1":false,"active2":false});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e480f561627c0c63e7dbaa9")
}
> db.demo266.insertOne({"active1":false,"active2":true});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e480f701627c0c63e7dbaaa")
}Display all documents from a collection with the help of find() method −
> db.demo266.find();
This will produce the following output −
{ "_id" : ObjectId("5e480f4b1627c0c63e7dbaa7"), "active1" : true, "active2" : false }
{ "_id" : ObjectId("5e480f501627c0c63e7dbaa8"), "active1" : true, "active2" : true }
{ "_id" : ObjectId("5e480f561627c0c63e7dbaa9"), "active1" : false, "active2" : false }
{ "_id" : ObjectId("5e480f701627c0c63e7dbaaa"), "active1" : false, "active2" : true }Following is the query to use $or with $ne operator −
> db.demo266.find({$or:[{"active1":{"$ne":true}},{"active2":{"$ne":true}}]});This will produce the following output −
{ "_id" : ObjectId("5e480f4b1627c0c63e7dbaa7"), "active1" : true, "active2" : false }
{ "_id" : ObjectId("5e480f561627c0c63e7dbaa9"), "active1" : false, "active2" : false }
{ "_id" : ObjectId("5e480f701627c0c63e7dbaaa"), "active1" : false, "active2" : true }
Updated on: 31-Mar-2020
163 Views
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