Postgres或类似的RDBM-获取哈希而不是数据列表

Question

I am wondering if there is some way to retrieve a hash from the database instead of a list. (I realize that this probably makes streaming data a little bit harder)

Instead of this:

 { .  // result set val 1
    "id": 1,
    "me": 1,
    "you": 2,
    "contactTime": 1540794446465220000
},
{     // result set val 2
    "id": 2,
    "me": 2,
    "you": 1,
    "contactTime": 1540794446465223000
}

I am looking to get a hash from the DB, pre-constructed

{
    "1": {
        "id": 1,
        "me": 1,
        "you": 2,
        "contactTime": 1540794446465220000
    },
    "2": {
        "id": 2,
        "me": 2,
        "you": 1,
        "contactTime": 1540794446465223000
    }
}

in Golang and Postgres (or similar RDBMs) is this possible somehow?