在 PostgreSQL 中扩展 json 数组以产生分析

Question

假设我们在 PostgreSQL 上使用jsonb 有下表：

create table writer
(
  "firstName" varchar,
  "surName"   varchar,
  books       jsonb
);

以下数据可用：

INSERT INTO public.writer ("firstName", "surName", books) VALUES ('William', 'Shakespeare', '[{"name": "Hamlet"}, {"name": "Romeo and Juliet"}]');
INSERT INTO public.writer ("firstName", "surName", books) VALUES ('Agatha', 'Christie', '[{"name": "Hercule Poirot"}, {"name": "Miss Marple"}]');

是否可以像 PowerBI expand 一样将 JSON 数组扩展为 2 列并得到以下结果？

firstName	surName	bookName
William	Shakespeare	Hamlet
William	Shakespeare	Juliet
Agatha	Christie	Hercule Poirot
Agatha	Christie	Miss Marple

而不是

firstName	surName	books
William	Shakespeare	[{"name": "Hamlet"}, {"name": "Romeo and Juliet"}]
Agatha	Christie	[{"name": "Hercule Poirot"}, {"name": "Miss Marple"}]

示例数据库：http://sqlfiddle.com/#!17/87ca94/2

Answer 1

您可以使用jsonb_array_elements() 获取每个数组元素一行：

select w."firstName", w."surName", b.book ->> 'name' as book_name
from writer w
  cross join jsonb_array_elements(books) as b(book)

Online example