Arrays 将多个Json数组转换为单个数组，而不是父数组中的数组

我有以下两行Json

  {
            "attributes": [{
                "name": "text-1580797977710",
                "value": "Nikesh Niroula"
            }, {
                "name": "email-1580797979166",
                "value": "nikesh@gmail.com"
            }]
          }


{
    "attributes": [{
            "name": "text-1580797977720",
            "value": "Denver"
        }, {
            "name": "text-1580797977723",
            "value": "colarado"
        },
        {
            "name": "text-1580797977727",
            "value": "USA"
        }
    ]
}

我需要使用postgresql将上述json聚合到一个数组中，预期结果如下。我尝试使用json_agg，但这将在主数组中添加一个内部数组。可能有多个json，而不仅仅是2个

  {
        "attributes": [{
                "name": "text-1580797977710",
                "value": "Nikesh Niroula"
            }, {
                "name": "email-1580797979166",
                "value": "nikesh@gmail.com"
            }, {
                "name": "text-1580797977720",
                "value": "Denver"
            }, {
                "name": "text-1580797977723",
                "value": "colarado"
            },
            {
                "name": "text-1580797977727",
                "value": "USA"
            }
        ]

     }

你可以用 串联运算符（

|

）以及

jsonb_数组_元素

jsonb_agg

可以解决您的问题

with t (id,
attr1,
attr2) as (
values (1,
'{
      "attributes": [
        {
          "name": "one-1",
          "value": "Nikesh Niroula"
        }]}'::jsonb,
'{"attributes": [
        {
          "name": "one-2",
          "value": "Nikesh Niroula"
        }]}'::jsonb) ,
(1,
'{
      "attributes": [
        {
          "name": "two-1",
          "value": "Nikesh Niroula"
        }]}'::jsonb,
'{"attributes": [
        {
          "name": "two-2",
          "value": "Nikesh Niroula"
        }]}'::jsonb) ,
(1,
'{
      "attributes": [
        {
          "name": "three-1",
          "value": "Nikesh Niroula"
        }]}'::jsonb,
'{"attributes": [
        {
          "name": "three-2",
          "value": "Nikesh Niroula"
        }]}'::jsonb) ,
(2,
'{
      "attributes": [
        {
          "name": "four-1",
          "value": "Nikesh Niroula"
        }]}'::jsonb,
'{"attributes": [
        {
          "name": "four-2",
          "value": "Nikesh Niroula"
        }]}'::jsonb) )
select
    id ,
    jsonb_agg(value)
from
    t,
    jsonb_array_elements(attr1->'attributes' ||(attr2->'attributes'))
group by
    1;

你可以用 串联运算符（

|

）以及

jsonb_数组_元素

jsonb_agg

可以解决您的问题

with t (id,
attr1,
attr2) as (
values (1,
'{
      "attributes": [
        {
          "name": "one-1",
          "value": "Nikesh Niroula"
        }]}'::jsonb,
'{"attributes": [
        {
          "name": "one-2",
          "value": "Nikesh Niroula"
        }]}'::jsonb) ,
(1,
'{
      "attributes": [
        {
          "name": "two-1",
          "value": "Nikesh Niroula"
        }]}'::jsonb,
'{"attributes": [
        {
          "name": "two-2",
          "value": "Nikesh Niroula"
        }]}'::jsonb) ,
(1,
'{
      "attributes": [
        {
          "name": "three-1",
          "value": "Nikesh Niroula"
        }]}'::jsonb,
'{"attributes": [
        {
          "name": "three-2",
          "value": "Nikesh Niroula"
        }]}'::jsonb) ,
(2,
'{
      "attributes": [
        {
          "name": "four-1",
          "value": "Nikesh Niroula"
        }]}'::jsonb,
'{"attributes": [
        {
          "name": "four-2",
          "value": "Nikesh Niroula"
        }]}'::jsonb) )
select
    id ,
    jsonb_agg(value)
from
    t,
    jsonb_array_elements(attr1->'attributes' ||(attr2->'attributes'))
group by
    1;

---

在将它们提供给agg函数之前，需要取消对它们的测试。如果表格为“j”，列为“x”，则：

---

在将它们提供给agg函数之前，需要取消对它们的测试。如果表格为“j”，列为“x”，则：

---

这应该适用于任意数量的行，还是仅适用于两个值？任意数量的行。这应该适用于任意数量的行，还是仅适用于两个值？任意数量的行。我将有未定义的行数-我的意思是不只是两行必须看到@jjanes的答案，使用

jsonb_数组_元素

。我将有未定义的行数-我的意思是不只是2行必须看到@jjanes的答案，使用

jsonb_数组_元素

。