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MongoDB aggregation framework match OR is possible?
Let us first create a collection with the document. The query to create a collection with a document is as follows −
> db.aggregationFrameworkWithOrMatchDemo.insertOne({"StudentFirstName":"John", "StudentLastName":"Smith","StudentAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5c8ac3a96cea1f28b7aa080d") } > db.aggregationFrameworkWithOrMatchDemo.insertOne({"StudentFirstName":"Carol", "StudentLastName":"Tayor","StudentAge":24}); { "acknowledged" : true, "insertedId" : ObjectId("5c8ac3bc6cea1f28b7aa080e") } > db.aggregationFrameworkWithOrMatchDemo.insertOne({"StudentFirstName":"David", "StudentLastName":"Miller","StudentAge":21}); { "acknowledged" : true, "insertedId" : ObjectId("5c8ac3ce6cea1f28b7aa080f") } > db.aggregationFrameworkWithOrMatchDemo.insertOne({"StudentFirstName":"Bob", "StudentLastName":"Taylor","StudentAge":20}); { "acknowledged" : true, "insertedId" : ObjectId("5c8ac3e16cea1f28b7aa0810") } > db.aggregationFrameworkWithOrMatchDemo.insertOne({"StudentFirstName":"Robert", "StudentLastName":"Smith","StudentAge":20}); { "acknowledged" : true, "insertedId" : ObjectId("5c8ac3fb6cea1f28b7aa0811") } > db.aggregationFrameworkWithOrMatchDemo.insertOne({"StudentFirstName":"Mike", "StudentLastName":"Miller","StudentAge":27}); { "acknowledged" : true, "insertedId" : ObjectId("5c8ac4166cea1f28b7aa0812") }
Display all documents from a collection with the help of find() method. The query is as follows −
> db.aggregationFrameworkWithOrMatchDemo.find().pretty();
The following is the output −
{ "_id" : ObjectId("5c8ac3a96cea1f28b7aa080d"), "StudentFirstName" : "John", "StudentLastName" : "Smith", "StudentAge" : 23 } { "_id" : ObjectId("5c8ac3bc6cea1f28b7aa080e"), "StudentFirstName" : "Carol", "StudentLastName" : "Tayor", "StudentAge" : 24 } { "_id" : ObjectId("5c8ac3ce6cea1f28b7aa080f"), "StudentFirstName" : "David", "StudentLastName" : "Miller", "StudentAge" : 21 } { "_id" : ObjectId("5c8ac3e16cea1f28b7aa0810"), "StudentFirstName" : "Bob", "StudentLastName" : "Taylor", "StudentAge" : 20 } { "_id" : ObjectId("5c8ac3fb6cea1f28b7aa0811"), "StudentFirstName" : "Robert", "StudentLastName" : "Smith", "StudentAge" : 20 } { "_id" : ObjectId("5c8ac4166cea1f28b7aa0812"), "StudentFirstName" : "Mike", "StudentLastName" : "Miller", "StudentAge" : 27 }
Here is the query to aggregate framework match OR. We are considering StudentLastName as Smith or Miller −
> db.aggregationFrameworkWithOrMatchDemo.aggregate({ ... $match: { $or: [{ StudentLastName: 'Smith' }, { StudentLastName: 'Miller' }] }}).pretty();
The following is the output −
{ "_id" : ObjectId("5c8ac3a96cea1f28b7aa080d"), "StudentFirstName" : "John", "StudentLastName" : "Smith", "StudentAge" : 23 } { "_id" : ObjectId("5c8ac3ce6cea1f28b7aa080f"), "StudentFirstName" : "David", "StudentLastName" : "Miller", "StudentAge" : 21 } { "_id" : ObjectId("5c8ac3fb6cea1f28b7aa0811"), "StudentFirstName" : "Robert", "StudentLastName" : "Smith", "StudentAge" : 20 } { "_id" : ObjectId("5c8ac4166cea1f28b7aa0812"), "StudentFirstName" : "Mike", "StudentLastName" : "Miller", "StudentAge" : 27 }
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