在PostgreSQL中将嵌套的JSONB字段的ARRAY与类似JOIN的语句合并? [英] Merge nested ARRAY of JSONB fields with a JOIN-like statement in PostgreSQL?

问题描述

给出此表:

书

 id | data
----+-------------------------------------------------------
 1  | { title: 'Book 1', price: 10.5, authors: [{ id: 1}, { id: 2 }]}
 2  | { title: 'Book 2', price: 11.5, authors: [{ id: 2 } }

作者

 id | data
-----+-------------------------------------------------------
 1  | { name: 'Author 1', address: 'Address author 1' }
 2  | { name: 'Author 2', address: 'Address author 2' }

是否可以通过使用类似于JOIN的语句或使用jsonb函数合并作者的键数组元素来获得此结果?

Is it possible to obtain this result, by merging the authors key array elements, with a JOIN-like statement or using jsonb functions?

预订查询结果

 id | data
----+------------------------------------------------------------------------------------------------------
 1  | { title: 'Book 1', price: 10.5, authors: [{ id: 1, name: 'Author 1', address: 'Address author 1' }, { id: 2, name: 'Author 2', address: 'Address author 2'}] }
 2  | { title: 'Book 2', price: 11.5, authors: [{ id: 2, name: 'Author 2', address: 'Address author 2'}] }

谢谢

推荐答案

select b.data || jsonb_build_object('authors', jsonb_agg(a.data || 
jsonb_build_object('id', a.id)))
from books b
left join (select id, jsonb_array_elements(data->'authors') from books) ba on 
ba.id = b.id
left join authors a on a.id = ba.id
group by b.id;

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