[英]PostgreSQL - Move data from jsonb array to separate table
在我的PostgreSQL數據庫中,我具有以下架構:
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"]}');
現在,我想將question->>'suggestions'
移至suggestions
表。 所以
SELECT * FROM suggestions;
應該返回:
------------------------------------------------------------------
id | suggestion_test | slide_id
------------------------------------------------------------------
1 | Suggestion 1 | 1
2 | Suggestion 2 | 1
如何在PostgreSQL中做到這一點? 這是您可以嘗試使用的DBfiddle: https ://www.db-fiddle.com/f/oEQf7ntttV5Wu9wyiXbEFk/0
您可以使用jsonb_array_elements()
:
select jsonb_array_elements(question->'suggestions')
from slides;
我認為列suggestions.id
應該是serial
:
CREATE TABLE suggestions (
id serial,
slide_id integer,
suggestion_text text
);
使用函數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');
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