查询在postgres jsonb中相交的json键

问题描述 投票:0回答:2

我如何查询相交的jsonb键:

例如:

     kv                                 |        column1                   
-----------------------------------------------------------
[{"k1": "v1"}, {"k2": "v22"}]           | web
[{"k10": "v5"}, {"k9": "v21"}]          | mobile
[{"k1": "v1"}, {"k5": "v24"}]           | web1
[{"k5": "v1"}, {"k55": "v24"}]          | web1

这里,第1行和第3行有关键k1和第3行,第4行有关键k5

所以,答案应该是第1,3和4行。

sql postgresql jsonb
2个回答
1
投票

假设以下设置:

create table data (id serial, kv jsonb, col1 text);

insert into data (kv, col1)
values
('[{"k1": "v1"}, {"k2": "v22"}]', 'web'),
('[{"k10": "v5"}, {"k9": "v21"}]', 'mobile'),
('[{"k1": "v1"}, {"k5": "v24"}]', 'web1'),
('[{"k5": "v1"}, {"k55": "v24"}]', 'web1');

您可以通过首先规范化数据,然后对规范化数据进行自连接来获取这些行。要规范化数据,您需要两次取消JSON值:一次用于展平数组,另一次用于从JSON值中提取键:

with normalized as (
  select d.id, t2.*
  from data d
    join jsonb_array_elements(kv) as t1(kv) on true
    join jsonb_each_text(t1.kv) as t2(k,val) on true
)
select n1.*
from normalized n1
where exists (select *
              from normalized n2
              where n1.id <> n2.id 
                and n1.k = n2.k);

以上回报:

id | k  | val
---+----+----
 1 | k1 | v1 
 3 | k1 | v1 
 3 | k5 | v24
 4 | k5 | v1 

或者使用IN条件获取原始行:

with normalized as (
  select d.id, t2.*
  from data d
    join jsonb_array_elements(kv) as t1(kv) on true
    join jsonb_each_text(t1.kv) as t2(k,val) on true
)
select *
from data
where id in (select n1.id
            from normalized n1
            where exists (select *
                          from normalized n2
                          where n1.id <> n2.id 
                            and n1.k = n2.k))

收益:

id | kv                             | col1
---+--------------------------------+-----
 1 | [{"k1": "v1"}, {"k2": "v22"}]  | web 
 3 | [{"k1": "v1"}, {"k5": "v24"}]  | web1
 4 | [{"k5": "v1"}, {"k55": "v24"}] | web1

如果你没有将键/值对存储在数组中,这种类型的查询会更容易,'{"k1": "v1", "k2": "v22"}'对我来说比[{"k1": "v1"}, {"k2": "v22"}]更有意义


1
投票

你可以试试这个:

--This part is to simulate your table
with yourTable as (
select (string_to_array(t,'|'))[1]::jsonb kv,(string_to_array(t,'|'))[2] column1 from (
select unnest(string_to_array($$[{"k1": "v1"}, {"k2": "v22"}]           | web
[{"k10": "v5"}, {"k9": "v21"}]          | mobile
[{"k1": "v1"}, {"k5": "v24"}]           | web1
[{"k5": "v1"}, {"k55": "v24"}]          | web1$$::character varying,E'\n')) t

) b
) 
-- This is your request :
   select distinct kv,column1 from (
        select *,count(*) over (partition by elt) nb_inter from (
          select kv,column1,jsonb_object_keys(jsonb_array_elements(kv)) elt from yourTable
          ) a 
        ) b
where nb_inter >1
© www.soinside.com 2019 - 2024. All rights reserved.