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MongoDB query to filter by several array elements?
To filter by several array elements, use $elemMatch. Let us create a collection with documents −
> db.demo87.insertOne(
... {
... id:101,
... "Details": [
... {
... "EmployeeName": "Chris",
... "Salary": 45000
... },
... {
... "EmployeeName": "David",
... "Salary": 50000
... }
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2c113871bf0181ecc422ab")
}
> db.demo87.insertOne(
... {
... id:102,
... "Details": [
... {
... "EmployeeName": "Chris",
... "Salary": 65000
... },
... {
... "EmployeeName": "Mike",
... "Salary": 100000
... }
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2c114371bf0181ecc422ac")
}Display all documents from a collection with the help of find() method −
> db.demo87.find();
This will produce the following output −
{
"_id" : ObjectId("5e2c113871bf0181ecc422ab"), "id" : 101, "Details" : [
{ "EmployeeName" : "Chris", "Salary" : 45000 },
{ "EmployeeName" : "David", "Salary" : 50000 }
]
}
{
"_id" : ObjectId("5e2c114371bf0181ecc422ac"), "id" : 102, "Details" : [
{ "EmployeeName" : "Chris", "Salary" : 65000 },
{ "EmployeeName" : "Mike", "Salary" : 100000 }
]
}Following is the query to filter by several array elements −
> db.demo87.find({ Details: { $elemMatch: { "EmployeeName": 'Chris', "Salary": 65000 }}});This will produce the following output −
{
"_id" : ObjectId("5e2c114371bf0181ecc422ac"), "id" : 102, "Details" : [
{ "EmployeeName" : "Chris", "Salary" : 65000 },
{ "EmployeeName" : "Mike", "Salary" : 100000 }
]
}
Updated on: 30-Mar-2020
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