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How to implement MongoDB $or query?
The syntax is as follows for the $or query in MongoDB −
db.yourCollectionName.find({ $or : [ { "yourFieldName" : "yourValue1" }, {"yourFieldName":"yourValue2"},...........N ] } ).pretty();To understand the concept, let us create a collection with the document. The query to create a collection with a document is as follows −
> db.orDemo.insertOne({"UserName":"Larry","UserAge":23});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9491fd4cf1f7a64fa4df4c")
}
> db.orDemo.insertOne({"UserName":"David","UserAge":21});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9492074cf1f7a64fa4df4d")
}
> db.orDemo.insertOne({"UserName":"Mike","UserAge":25});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c94920e4cf1f7a64fa4df4e")
}
> db.orDemo.insertOne({"UserName":"Sam","UserAge":20});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9492144cf1f7a64fa4df4f")
}
> db.orDemo.insertOne({"UserName":"Carol","UserAge":24});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c94921d4cf1f7a64fa4df50")
}
> db.orDemo.insertOne({"UserName":"Bob","UserAge":22});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c94922c4cf1f7a64fa4df51")
}Display all documents from a collection with the help of find() method. The query is as follows −
> db.orDemo.find().pretty();
The following is the output:
{
"_id" : ObjectId("5c9491fd4cf1f7a64fa4df4c"),
"UserName" : "Larry",
"UserAge" : 23
}
{
"_id" : ObjectId("5c9492074cf1f7a64fa4df4d"),
"UserName" : "David",
"UserAge" : 21
}
{
"_id" : ObjectId("5c94920e4cf1f7a64fa4df4e"),
"UserName" : "Mike",
"UserAge" : 25
}
{
"_id" : ObjectId("5c9492144cf1f7a64fa4df4f"),
"UserName" : "Sam",
"UserAge" : 20
}
{
"_id" : ObjectId("5c94921d4cf1f7a64fa4df50"),
"UserName" : "Carol",
"UserAge" : 24
}
{
"_id" : ObjectId("5c94922c4cf1f7a64fa4df51"),
"UserName" : "Bob",
"UserAge" : 22
}Here is the query for $or −
> db.orDemo.find({ $or : [ { "UserName" : "Carol" }, {"UserName":"Larry"} ] } ).pretty();The following is the output:
{
"_id" : ObjectId("5c9491fd4cf1f7a64fa4df4c"),
"UserName" : "Larry",
"UserAge" : 23
}
{
"_id" : ObjectId("5c94921d4cf1f7a64fa4df50"),
"UserName" : "Carol",
"UserAge" : 24
}
Updated on: 30-Jul-2019
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