json - 如何检查一个值是否存在于 JSONB 列表中

Question

我试图在 PostgreSQL 11 JSONB 查询中找出

SELECT id, my_json_field #>> '{field_depth_1, field_depth_2}' 
FROM my_data 
WHERE my_json_field @> '{"other_field": 3}'::jsonb

如果 other_field 是一个键值对，这将完美地工作，我得到每一行 other_field = 3。但是，如果 other_field 是一个值列表，例如:[2,3,6,8,10]，我想为每一行找出值 3 是否存在于由other_field，查询应该怎么写？

Answer 1

使用运算符@>。每the documentation:

@> jsonb Does the left JSON value contain the right JSON path/value entries at the top level?

例子:

with my_data(id, my_json_field) as (
values
    (1, '{"field_depth_1": {"field_depth_2": "something 1"}, "other_field": 3}'::jsonb),
    (2, '{"field_depth_1": {"field_depth_2": "something 2"}, "other_field": 4}'),
    (3, '{"field_depth_1": {"field_depth_2": "something 3"}, "other_field": [2,3,6,8,10]}'),
    (4, '{"field_depth_1": {"field_depth_2": "something 4"}, "other_field": [2,4,6,8,10]}')
)

select id, my_json_field #>> '{field_depth_1, field_depth_2}' as value
from my_data 
where my_json_field->'other_field' @> '3'

 id |    value    
----+-------------
  1 | something 1
  3 | something 3
(2 rows)