在UPDATE使用删除（ -
）并连接（||）运算符，如：

create table example(id int primary key, js jsonb);
insert into example values
    (1, '{"nme": "test"}'),
    (2, '{"nme": "second test"}');

update example
set js = js - 'nme' || jsonb_build_object('name', js->'nme')
where js ? 'nme'
returning *;

 id |           js            
----+-------------------------
  1 | {"name": "test"}
  2 | {"name": "second test"}
(2 rows)