Arrays 将json对象数组转换为json

在postgres表中，我有一些这种格式的jsonb

[{"type": "pet", "animal": "cat"}, {"type": "farm", "animal": "cow","colour": "brown"}]

{"cat": {"type": "pet", "animal": "cat"}, "cow" {"type": "farm", "animal": "cow", "colour": "brown"}

但我想把它转换成这种格式

[{"type": "pet", "animal": "cat"}, {"type": "farm", "animal": "cow","colour": "brown"}]

{"cat": {"type": "pet", "animal": "cat"}, "cow" {"type": "farm", "animal": "cow", "colour": "brown"}

我想不出来，也找不到互联网上有这种格式的jsonb的人。谁能解决这个问题？理想情况下，没有“color”键/值的数据集不会有{“color”：null}，但根本不会有“color”键

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我使用的是postgres 9.6，这里有一个选项可以通过取消对json数组的测试并将其重新聚合到一个对象中来实现：

select x.new_js_col
from mytable t
cross join lateral (
    select jsonb_object_agg(obj ->> 'animal', to_jsonb(obj)) new_js_col
    from jsonb_array_elements(t.js_col) as x(obj)
) x(new_js_col)

这假设您在表

mytable

中有一个名为

js\u col

的jsonb列

：

| new_js_col | | :----------------------------------------------------------------------------------------------------- | | {"cat": {"type": "pet", "animal": "cat"}, "cow": {"type": "farm", "animal": "cow", "colour": "brown"}} | |新_js_col| | :----------------------------------------------------------------------------------------------------- | |{“猫”：{“类型”：“宠物”、“动物”：“猫”}，“牛”：{“类型”：“农场”、“动物”：“牛”、“颜色”：“棕色”}|