How to get data by query builder in laravel

I use join in query builder and here is the output

[
    {
        "id": 7,
        "name": "class 1",
        "idSubject": 17,
        "nameSubject": "Math"
    },
    {
        "id": 7,
        "name": "class 1",
        "idSubject": 16,
        "nameSubject": "history"
    },
    {
        "id": 8,
        "name": "class 2",
        "idSubject": 15,
        "nameSubject": "Computer"
    },
    {
        "id": 8,
        "name": "class 2",
        "idSubject": 19,
        "nameSubject": "geography"
    }
]

You can see id and name of class 1, 2 appearing twice. So, how to make it appear once.

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