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。
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
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