postgresql-9.5 - 无法按 jsonb 类型的字段中的节点进行过滤

Question

表有两列：id和data。

列数据的类型为jsonb

json：

  "weight": {
    "qty": 300,
    "unit": {
      "name": "gram",
      "title": {
        "en": "g"
      }
    }
  

我想按 json 的节点weight和qty过滤。

这里查询：

SELECT
(product.data #>'{weight,qty}') AS weight
FROM product 
WHERE weight = 300
order by id desc

但我得到错误：

ERROR:  column "weight" does not exist
LINE 4: WHERE weight = 123
              ^
SQL state: 42703
Character: 70