小编Jor*_*ole的帖子

考虑以下存储在 Firebase 中的数据：

{
  "beers": {
    "-jwhkclclmecl": {
      "name": "Two Hearted Ale",
      "type": "IPA",
      "brewery": "Bells"
    },
    "-ckqjheh292od": {
      "name": "Dirty Blonde Ale",
      "type": "Pale Wheat",
      "brewery": "Atwater"
    },
    "-hcwiu3cp902d": {
      "name": "Diabolical",
      "type": "IPA",
      "brewery": "North Peak"
    }
  }
}

是否可以为 Firebase 构建查询以返回其中一个子节点的唯一值的数组。例如返回["IPA", "Pale Wheat"]