firebase - Retrieving values from Firebase database?

Question

Here is my structure of realtime database in firebase

{
    "student1" : {
        "name" : "somename",
        "skillset" : [
            "cpp",
            "c",
            "java"
        ],
        other properties
    },
    "student2" : {
        "name" : "somename",
        "skillset" : [
            "javascript",
            "c",
            "python"
        ],
        other properties
    },
    "student3" : {
        "name" : "somename",
        "skillset" : [
            "cpp",
            "java"
        ],
        other properties
    },
    "student4" : {
        "name" : "somename",
        "skillset" : [
            "java",
            "kotlin"
        ],
        other properties
    } }

I want to retrieve all the students having some specific set of all skills

e.g. skills = ["cpp","java"]
then answer should be ["student1","student3"]

标签： firebasefirebase-realtime-database

Answer 1

That is not possible under this structure, as firebase only support filtering by one child. In your case, you would need to get all the data and filter by code