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How to implement MongoDB $or operator
Evaluate one or more expressions using the $or operator in MongoDB. Following is the syntax −
db.yourCollectionName.find({ $or: [{ "yourFieldName": yourValue1 }, { "yourFieldName": yourValue2} ] } ).pretty();Let us first create a collection with documents −
> db.orOperatorDemo.insertOne({"StudentNames":["John","Carol","Sam"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd6b80a6d78f205348bc61b")
}
> db.orOperatorDemo.insertOne({"StudentNames":["Robert","Chris","David"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd6b8266d78f205348bc61c")
}
> db.orOperatorDemo.insertOne({"StudentNames":["John"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd6b8346d78f205348bc61d")
}Following is the query to display all documents from a collection with the help of find() method −
> db.orOperatorDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cd6b80a6d78f205348bc61b"),
"StudentNames" : [
"John",
"Carol",
"Sam"
]
}
{
"_id" : ObjectId("5cd6b8266d78f205348bc61c"),
"StudentNames" : [
"Robert",
"Chris",
"David"
]
}
{
"_id" : ObjectId("5cd6b8346d78f205348bc61d"),
"StudentNames" : [
"John"
]
}Here is the query to $or operator syntax −
> db.orOperatorDemo.find({ $or: [{ "StudentNames": "Carol" }, { "StudentNames": "John"} ] } ).pretty();This will produce the following output −
{
"_id" : ObjectId("5cd6b80a6d78f205348bc61b"),
"StudentNames" : [
"John",
"Carol",
"Sam"
]
}
{
"_id" : ObjectId("5cd6b8346d78f205348bc61d"),
"StudentNames" : [
"John"
]
}
Updated on: 30-Jul-2019
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