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Fetch records in MongoDB on querying its subset
You can use $all operator. Let us first create a collection with documents −
> db.subsetOfAnArrayDemo.insertOne({"StudentProgrammingSkills":
["Java","MongoDB","MySQL","C++","Data Structure","Algorithm","Python","Oracle","SQL Server"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cb9d1e1895c4fd159f80804")
}Following is the query to display all documents from the collection with the help of find() method −
> db.subsetOfAnArrayDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cb9d1e1895c4fd159f80804"),
"StudentProgrammingSkills" : [
"Java",
"MongoDB",
"MySQL",
"C++",
"Data Structure",
"Algorithm",
"Python",
"Oracle",
"SQL Server"
]
}Following is the query to get the subset of an array −
> db.subsetOfAnArrayDemo.find({ StudentProgrammingSkills:
{ $all: [ 'MongoDB', 'MySQL' ] } } ).pretty();This will produce the following output −
{
"_id" : ObjectId("5cb9d1e1895c4fd159f80804"),
"StudentProgrammingSkills" : [
"Java",
"MongoDB",
"MySQL",
"C++",
"Data Structure",
"Algorithm",
"Python",
"Oracle",
"SQL Server"
]
}
Updated on: 30-Jul-2019
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