如何在Postgresql中jsonb中的where条件下获取数据

Question

我有一个这样的表 data_table

| id         | reciever                                     
| (bigint)   |(jsonb)                                      

----------------------------------------------------------------------
|    1       | [{"name":"ABC","email":"abc@gmail.com"},{"name":"ABDFC","email":"ab34c@gmail.com"},...]
|    2       | [{"name":"DEF","email":"deef@gmail.com"},{"name":"AFDBC","email":"a45bc@gmail.com"},...]
|    3       | [{"name":"GHI","email":"ghfi@gmail.com"},{"name":"AEEBC","email":"5gf@gmail.com"},...]
|    4       | [{"name":"LMN","email":"lfmn@gmail.com"},{"name":"EEABC","email":"gfg5@gmail.com"},...]
|    5       | [{"name":"PKL","email":"dfdf@gmail.com"},{"name":"ABREC","email":"a4rbc@gmail.com"},...]
|    6       | [{"name":"ANI","email":"fdffd@gmail.com"},{"name":"ABWC","email":"abrtc@gmail.com"},...]

当我在 pg admin 上运行时，它工作正常

I want to fetch row by putting email in where condition like select * from data_table where receiver = 'abc@gmail.com'. 数组中可以有更多数据，所以我显示了“...”。

我试过where receiver-->>'email'='abc@gmail.com'，但它在{"name":"ABC","email":"abc@gmail.com"} only不在数组中的情况下工作，我必须检查数组中的每封电子邮件

我们将不胜感激。

Answer 1

一种选择是使用exists 和jsonb_array_elements()：

select t.*
from mytable t
where exists (
    select 1
    from jsonb_array_elements(t.receiver) x(elt)
    where x.elt ->> 'email' = 'abc@gmail.com'
)

这将为您提供数组中至少一个元素具有给定电子邮件的所有行。

如果您想实际展示匹配的元素，则可以使用lateral join 代替（如果数组中的多个元素具有给定的电子邮件，这会重复该行）：

select t.*, x.elt
from mytable t
cross join lateral jsonb_array_elements(t.receiver) x(elt)
where x.elt ->> email = 'abc@gmail.com'