Postgresql：使用jsonb字段在时间范围之间查询

Question

我有一个包含两个字段的表：

id(serial), data(jsonb)

对于数据，我有记录，其中Datetime字段存储为UNIX时间戳：

{"Device":132,"Datetime": 1434166552,...}

我正在尝试查询范围：

SELECT *
FROM trips
WHERE data->>'Datetime' BETWEEN
    EXTRACT(EPOCH FROM date '2014-04-01') AND
    EXTRACT(EPOCH FROM date '2014-04-15' + interval '1 day')
    AND id = 123

消息

ERROR:  operator does not exist: text >= double precision
LINE 3: WHERE data->>'Datetime' BETWEEN

我做错了什么，请云有人帮帮我吗？感谢。

Answer 1

->>运算符返回JSON对象字段text（请参阅here）。你需要施展它：

SELECT *
FROM trips
WHERE (data->>'Datetime')::int 
  BETWEEN EXTRACT(EPOCH FROM date '2014-04-01') 
      AND EXTRACT(EPOCH FROM date '2014-04-15' + interval '1 day')
  AND id = 123