Question

我需要从jsonb类型列中删除一些值。

jsonb值

{"services": [59, 61], "locations": ["34"]}

此查询无效。

select jsonb_set(data, '{services}', (data->'services') - 59) from employees 
WHERE data @> '{"services":[59]}';

但是，这可行：

select jsonb_set(data, '{locations}', (data->'locations') - '34') from 
employees WHERE data @> '{"services":[59]}';

如何在没有键索引和单引号的情况下从59中删除services？

Answer 1

（数据->'服务'）-59

按索引删除项目

示例

/*
 - 3 is the index to be deleted in a NUMERIC array

 0  14
 1  15
 2  16
 3  17   * to be deleted
 4  18

*/
select '[14, 15, 16, 17, 18]'::jsonb - 3

| ?column?         |
| :--------------- |
| [14, 15, 16, 18] |

文本元素数组

CREATE TABLE employees  (
  id serial primary key,
  data jsonb
);

✓

insert into employees(data) values 
('{"services": [50, 57, 59, 61], "locations": ["34"]}'::jsonb),
('{"services": [19, 21], "locations": ["34"]}'::jsonb)
;

2 rows affected

-- The link was used (https://dba.stackexchange.com/questions/54283/how-to-turn-json-array-into-postgres-array)

select 
  employees.id,
  jsonb_set(data, '{services}', ('[' || string_agg('"' || elem::text || '"' ,' ,') || ']')::jsonb - '59')
from employees, json_array_elements((data->'services')::json) elem
WHERE data @> '{"services":[59]}'
group by employees.id
;

id | jsonb_set                                            
-: | :----------------------------------------------------
 1 | {"services": ["50", "57", "61"], "locations": ["34"]}

db <>提琴here

PostgreSQL：从JSONB列中删除值

1 个答案: