For specific documents, use MongoDB $in. Let us create a collection with documents −
> db.demo511.insertOne({"ListOfProject":["Library Management System","Hospital Management System"]}); { "acknowledged" : true, "insertedId" : ObjectId("5e88473a987b6e0e9d18f585") } > db.demo511.insertOne({"ListOfProject":["Online Web Tracking","Library Management System"]}); { "acknowledged" : true, "insertedId" : ObjectId("5e884751987b6e0e9d18f586") } > db.demo511.insertOne({"ListOfProject":["Online Shopping Cart","Hospital Management System"]}); { "acknowledged" : true, "insertedId" : ObjectId("5e884776987b6e0e9d18f587") }
Display all documents from a collection with the help of find() method −
> db.demo511.find();
This will produce the following output −
{ "_id" : ObjectId("5e88473a987b6e0e9d18f585"), "ListOfProject" : [ "Library Management System", "Hospital Management System" ] } { "_id" : ObjectId("5e884751987b6e0e9d18f586"), "ListOfProject" : [ "Online Web Tracking", "Library Management System" ] } { "_id" : ObjectId("5e884776987b6e0e9d18f587"), "ListOfProject" : [ "Online Shopping Cart", "Hospital Management System" ] }
Following is the query to finding matching documents −
> db.demo511.find({ "ListOfProject":{$in:["Hospital Management System","Online Shopping Cart"]}});
This will produce the following output −
{ "_id" : ObjectId("5e88473a987b6e0e9d18f585"), "ListOfProject" : [ "Library Management System", "Hospital Management System" ] } { "_id" : ObjectId("5e884776987b6e0e9d18f587"), "ListOfProject" : [ "Online Shopping Cart", "Hospital Management System" ] }