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How to fire find query on sub-documents in MongoDB?
For sub-documents, use the dot notation. Let us first create a collection with documents −
> db.demo537.insertOne({"details":{"SubjectName":"MongoDB"}});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8c8a10ef4dcbee04fbbc05")
}
> db.demo537.insertOne({"details":{"SubjectName":"MySQL"}});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8c8a4bef4dcbee04fbbc06")
}
> db.demo537.insertOne({"details":{"SubjectName":"Java"}});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8c8a51ef4dcbee04fbbc07")
}Display all documents from a collection with the help of find() method −
> db.demo537.find();
This will produce the following output −
{ "_id" : ObjectId("5e8c8a10ef4dcbee04fbbc05"), "details" : { "SubjectName" : "MongoDB" } }
{ "_id" : ObjectId("5e8c8a4bef4dcbee04fbbc06"), "details" : { "SubjectName" : "MySQL" } }
{ "_id" : ObjectId("5e8c8a51ef4dcbee04fbbc07"), "details" : { "SubjectName" : "Java" } }Following is the query to fire query on sub-documents in MongoDB −
> db.demo537.count({'details.SubjectName': 'MongoDB'})This will produce the following output −
1
Updated on: 14-May-2020
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