PostgreSQL

Question

在我的 PostgreSQL 数据库中，我有以下架构：

CREATE TABLE slides (
    id integer,
    question jsonb DEFAULT '{}'::jsonb
);

CREATE TABLE suggestions (
    id integer,
    slide_id integer,
    suggestion_text text
);


INSERT INTO slides (id, question)
  VALUES (1, '{"suggestions": ["Suggestion 1", "Suggestion 2"]}');

现在我想将 question->>'suggestions' 移动到 suggestions table。所以

SELECT * FROM suggestions; 应该 return:

------------------------------------------------------------------
id     | suggestion_test   | slide_id
------------------------------------------------------------------
1      | Suggestion 1      | 1     
2      | Suggestion 2      | 1

我如何在 PostgreSQL 中执行此操作？这是您可以试验的 DBfiddle： https://www.db-fiddle.com/f/oEQf7ntttV5Wu9wyiXbEFk/0

Answer 1

您可以使用 jsonb_array_elements():

select jsonb_array_elements(question->'suggestions')
from slides;

Answer 2

我认为 suggestions.id 列应该是 serial:

CREATE TABLE suggestions (
    id serial,
    slide_id integer,
    suggestion_text text
);

使用函数jsonb_array_elements_text().

insert into suggestions(slide_id, suggestion_text)
select 
    id as slide_id, 
    value as suggestion_text
from slides
cross join jsonb_array_elements_text(question->'suggestions');

DbFiddle.

PostgreSQL - 将数据从 jsonb 数组移动到分隔 table

PostgreSQL - Move data from jsonb array to separate table

sql

jsonb