Question

我有多个jsonb列，我想从每一列中提取数据。我正在使用postgressql。

输入：-

setUp()

输出：-

ID  Jsoncol1    Jsoncol2    Jsoncol3    Date
0   {"@class":  "team": {"id":"Captain","dob": [1990, 9, 11]}}  {"@class":  "group": {"id":"Colour","dob": [1990, 9, 11]}}  {"@class":  "person": {"id":"Red","dob": [1990, 9, 11]}]}   13/05/2019

Answer 1

如果没有@class:（这会使JSON值无效），则数据可能看起来像这样

id | jsoncol1                                        | jsoncol2                                        | jsoncol3                                      | mydate    
-: | :---------------------------------------------- | :---------------------------------------------- | :-------------------------------------------- | :---------
 0 | {"team": {"id":"Captain","dob": [1990, 9, 11]}} | {"group": {"id":"Colour","dob": [1990, 9, 11]}} | {"person": {"id":"Red","dob": [1990, 9, 11]}} | 2019-05-13

问题似乎在于，从JSON对象提取id值：

demo:db<>fiddle

SELECT
    id,
    jsoncol1 -> 'team' ->> 'id' AS team,
    jsoncol2 -> 'group' ->> 'id' AS "group",
    jsoncol3 -> 'person' ->> 'id' AS person,
    mydate
FROM mytable

-> Postgres JSON documentation

从Postgres中的多个jsonb列中提取值

1 个答案: