我在表上有一个jsonb列,进度(称为t)。它具有这样的数据:
{
"2": {
"8": "completed",
"9": "completed",
"10": "completed",
"percent_completed": 0
},
"5": {
"40": "completed",
"percent_completed": 0
}
}
我正在尝试获取一个看起来像这样的表:
Top Level | Send Level | status
-------------------------------
| 2 | 8 | completed
| 2 | 9 | completed
| 2 | 10 | completed
| 5 | 40 | completed
我正在努力获得有效的声明。我快到了(我可以到达顶层列),但是我不能到达第二层。这样可以提取第一个密钥:
select top_level
, progress
from t
cross join jsonb_object_keys(progress) top_level
当我尝试获得第二级时,它不起作用。我正在努力回答为什么:
select top_level
, second_level
, t
from t
cross join jsonb_object_keys(progress) top_level
cross join jsonb_object_keys(progress->top_level) second_level
我收到以下错误:ERROR: cannot call jsonb_object_keys on a scalar
我正在使用Postgres 11.8
我尝试了不同的json运算符,并以多种不同的方式转换结果数据,但我一直在努力弄清楚。非常感谢您的帮助。
答案 0 :(得分:1)
使用jsonb_each()
和jsonb_each_text()
代替jsonb_object_keys()
:
select
t1.key as top_level,
t2.key as send_level,
t2.value as value
from t
cross join jsonb_each(progress) as t1
cross join jsonb_each_text(t1.value) as t2
where t2.key <> 'percent_completed'