sql - 如何从 JSONB 列中提取数据

Question

我们在 vehicle 表中以 JSONB 格式存储了一个 vehicle_info。

id |                                     vehicle_info(JSONB)                                     
----+------------------------------------------------------------------------------------
  1 | {"milestone": {"Honda_car": {"status":"sold"}}
  3 | {"milestone": {"Mitsubishi_car", {"status":"available"}}
  2 | {"milestone": {"Honda_car", {"status":"available"}}

如何提取后缀为car的数据。下面是我能想到但最终出错的。

select * from vehicle where milestone -> LIKE '%_car' ->>'status'

Answer 1

如果我没听错，您可以使用 jsonb_object_keys() 枚举键，然后过滤那些以 '_car' 结尾的键，最后提取值:

select t.*, t.vehicle_info -> 'milestone' -> k.val ->> 'status' status
from mytable t
cross join lateral jsonb_object_keys(t.vehicle_info -> 'milestone') as k(val)
where k.val like '%_car'

Demo on DB Fiddle :

id | vehicle_info                                               | status   
-: | :--------------------------------------------------------- | :--------
 1 | {"milestone": {"Honda_car": {"status": "sold"}}}           | sold     
 3 | {"milestone": {"Mitsubishi_car": {"status": "available"}}} | available
 2 | {"milestone": {"Honda_car": {"status": "available"}}}      | available