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How to get tag count in MongoDB query results based on list of names?
You can use $in operator. Let us first create a collection with documents −
> db.tagCountDemo.insertOne({"ListOfNames":["John","Sam","Carol"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd64b387924bb85b3f48944") } > db.tagCountDemo.insertOne({"ListOfNames":["Bob","David","John"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd64b4b7924bb85b3f48945") } > db.tagCountDemo.insertOne({"ListOfNames":["Mike","Robert","Chris"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd64b5d7924bb85b3f48946") } > db.tagCountDemo.insertOne({"ListOfNames":["James","Carol","Jace"]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd64b717924bb85b3f48947") }
Following is the query to display all documents from a collection with the help of find() method −
> db.tagCountDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cd64b387924bb85b3f48944"), "ListOfNames" : [ "John", "Sam", "Carol" ] } { "_id" : ObjectId("5cd64b4b7924bb85b3f48945"), "ListOfNames" : [ "Bob", "David", "John" ] } { "_id" : ObjectId("5cd64b5d7924bb85b3f48946"), "ListOfNames" : [ "Mike", "Robert", "Chris" ] } { "_id" : ObjectId("5cd64b717924bb85b3f48947"), "ListOfNames" : [ "James", "Carol", "Jace" ] }
Following is the query to get tag count in MongoDB
> db.tagCountDemo.find({"ListOfNames":{$in:['John','Carol']}});
This will produce the following output −
{ "_id" : ObjectId("5cd64b387924bb85b3f48944"), "ListOfNames" : [ "John", "Sam", "Carol" ] } { "_id" : ObjectId("5cd64b4b7924bb85b3f48945"), "ListOfNames" : [ "Bob", "David", "John" ] } { "_id" : ObjectId("5cd64b717924bb85b3f48947"), "ListOfNames" : [ "James", "Carol", "Jace" ] }
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