查询 jsonb 列中的数组值

Question

I have a jsonb column called chores in my work table with data looking something like this:

[{"task": "feed_dog", "value": "Daily"},{"task": "mop_floor", "value": "Weekly"]

There could be zero to dozens of tasks in the chores array for each user.

How can I query by task name? For example, pull all records where at least one task is feed_dog .

SELECT chores->>'task' FROM work returns a bunch of null results, as does SELECT chores->'task' FROM work .

Answer 1

You need to unnest the array:

select w.*
from "work" w
where exists (select *
              from jsonb_array_elements(w.chores) as t(task)
              where t.task ->> 'task" = 'feed_dog');

With Postgres 12 this is a bit easier to write:

select *
from "work" w
where jsonb_path_exists(w.chores, '$[*] ? (@.task == "feed_dog")')