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Which MongoDB query finds same value multiple times in an array?
You can use $where operator along with some script.
Let us first create a collection with documents −
> dbsameValueMultipleTimesDemoinsertOne(
{
"ListOfPrice":[
{"Price": 110},
{"Price":130},
{"Price": 145}
]
}
);
{
"acknowledged" : true,
"insertedId" : ObjectId("5cefc4e6ef71edecf6a1f6b9")
}
> dbsameValueMultipleTimesDemoinsertOne(
{
"ListOfPrice":[
{"Price": 110},
{"Price":178},
{"Price": 110}
]
}
);
{
"acknowledged" : true,
"insertedId" : ObjectId("5cefc4e7ef71edecf6a1f6ba")
}Following is the query to display all documents from a collection with the help of find() method −
> dbsameValueMultipleTimesDemofind()pretty();
Output
{
"_id" : ObjectId("5cefc4e6ef71edecf6a1f6b9"),
"ListOfPrice" : [
{
"Price" : 110
},
{
"Price" : 130
},
{
"Price" : 145
}
]
}
{
"_id" : ObjectId("5cefc4e7ef71edecf6a1f6ba"),
"ListOfPrice" : [
{
"Price" : 110
},
{
"Price" : 178
},
{
"Price" : 110
}
]
}Following is the query to find same value multiple times in an array −
> dbsameValueMultipleTimesDemofind({
"$where": function() {
return thisListOfPricefilter(function(p) {
return pPrice == 110;
})length > 1;
}
})Output
{ "_id" : ObjectId("5cefc4e7ef71edecf6a1f6ba"), "ListOfPrice" : [ { "Price" : 110 }, { "Price" : 178 }, { "Price" : 110 } ] }
Updated on: 30-Jul-2019
71 Views
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