Syntax error MongoDB query to find on the basis of true or false values

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: 2020-04-02T12:46:55+05:30

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