Question

我在Postgres 9.6中有一个jsonb列，其中包含以下形式的JSON数组：

[
  {
    "courses": { "course-1": { "graduated": false }, "course-5": { "graduated": true } }
  },
  {
    "courses": { "course-6": { "graduated": false } }
  }
]

我想找到一个查询就注册了course-1或course-12的所有用户。也就是说，course-1数组中任何条目的对象都在course-12对象中拥有courses或jsonb的用户。

我尝试了很多类似以下的操作，但是这些操作当然不起作用：

select enrollment_info from users where (enrollment_info @> '["courses" ?| array['course-1', 'course-12']]')

有关如何解决此问题的任何建议？谢谢！

Answer 1

您可以使用jsonb_array_elements对数组进行嵌套，然后检查是否存在至少一个搜索到的键：

select enrollment_info
from users,
jsonb_array_elements(enrollment_info) courses
where 
    courses->'courses'->'course-1' is not null
    or courses->'courses'->'course-12' is not null

Demo on DB Fiddle ：

with users as (
    select 
    '[ 
        { "courses": { "course-1": { "graduated": false }, "course-5": { "graduated": true } }},
        { "courses": { "course-6": { "graduated": false } } }
    ]'::jsonb enrollment_info
    union all select 
    '[ 
        { "courses": { "course-12": { "graduated": false }, "course-5": { "graduated": true } }}
    ]'::jsonb
    union all select 
    '[ 
        { "courses": { "course-4": { "graduated": false } }}
    ]'::jsonb
)
select enrollment_info
from users,
jsonb_array_elements(enrollment_info) courses
where 
    courses->'courses'->'course-1' is not null
    or courses->'courses'->'course-12' is not null

| enrollment_info                                                                                                                     |
| :---------------------------------------------------------------------------------------------------------------------------------- |
| [{"courses": {"course-1": {"graduated": false}, "course-5": {"graduated": true}}}, {"courses": {"course-6": {"graduated": false}}}] |
| [{"courses": {"course-5": {"graduated": true}, "course-12": {"graduated": false}}}]                                                 |

前两个数组匹配，因为它们分别包含course-1和course-12。第三个数组不匹配。

根据jsonb数组中的嵌套键查找行

1 个答案: