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MongoDB query to find on the basis of true or false values
To find on the basis of true or false values, use $exists in find(). You would also need dot notation for the same task.
Let us first create a collection with documents −
> db.demo367.insertOne(
... { "Id" : "102",
... "details" : [ { "Name" : "David"},
... { "Age" : 23, "CountryName" : "UK"} ],
... "isMarried" : false }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e57e0b62ae06a1609a00ae8")
}
> db.demo367.insertOne(
... { "Id" : "101",
... "details" : [ { "Name" : "Chris", "Subject" : [ "MySQL" ] },
... { "Age" : 21, "CountryName" : "US"} ],
... "isMarried" : true }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e57e0be2ae06a1609a00ae9")
}Display all documents from a collection with the help of find() method −
> db.demo367.find();
This will produce the following output −
{
"_id" : ObjectId("5e57e0b62ae06a1609a00ae8"), "Id" : "102", "details" : [
{ "Name" : "David" }, { "Age" : 23, "CountryName" : "UK" } ], "isMarried" : false }
{
"_id" : ObjectId("5e57e0be2ae06a1609a00ae9"), "Id" : "101", "details" : [
{ "Name" : "Chris", "Subject" : [ "MySQL" ] }, { "Age" : 21, "CountryName" : "US" } ], "isMarried" : true
}Following is the query to find on the basis of true false values by checking with $exists −
> db.demo367.find({"details.Subject": { $exists: false}});This will produce the following output −
{ "_id" : ObjectId("5e57e0b62ae06a1609a00ae8"), "Id" : "102", "details" : [ { "Name" : "David" }, { "Age" : 23, "CountryName" : "UK" } ], "isMarried" : false }
Updated on: 02-Apr-2020
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