需要创建一个Json_Object，其中可以包含多个嵌套的Json_objects，Json_arrays和Json_arrayaggs。
我用一些虚拟数据创建了这个表来演示这个问题：

create table test_tbl(
test_col1 varchar2(20), 
test_col2 varchar2(20), 
test_col3 varchar2(20),
test_col4 varchar2(20),
test_col5 varchar2(20),
test_col6 varchar2(20)

);

insert into test_tbl values('val0', 'val1', 'val2', 'val7', 'val11', 'val12');
insert into test_tbl values('val0', 'val3', 'val4', 'val7','val11', 'val12');
insert into test_tbl values('val0', 'val5', 'val6', 'val7','val13', 'val14');
insert into test_tbl values('val0', 'val5', 'val6', 'val7','val11', 'val12');
insert into test_tbl values('val0', 'val5', 'val6', 'val8','val11','val12');
insert into test_tbl values('val1', 'val9', 'val10', 'val7','val11', 'val12');
insert into test_tbl values('val1', 'val9', 'val10', 'val7','val13', 'val14');

当使用以下查询来创建Json_object时：

SELECT JSON_OBJECT (
         'output' VALUE JSON_ARRAYAGG(
           JSON_OBJECT(
             'common' VALUE test_col1,
             'list'   VALUE JSON_ARRAYAGG(
               JSON_OBJECT(
                 'key1' VALUE test_col2,
                 'key2' VALUE test_col3
               )
             ),
            'anotherlist' VALUE JSON_ARRAYAGG(
               JSON_OBJECT(
                 'key1' VALUE test_col5,
                 'key2' VALUE test_col6
               )
             )
           )
         )
       )
FROM   (
  SELECT DISTINCT
         test_col1, test_col2, test_col3, test_col5, test_col6
  FROM   test_tbl
  WHERE  test_col4 = 'val7'
)
GROUP BY
       test_col1

这会导致json在聚合数组中使用重复的键，值对-

{
  "output": [
    {
      "common": "val0",
      "list": [
        {
          "key1": "val5",
          "key2": "val6"
        },
        {
          "key1": "val3",
          "key2": "val4"
        },
        {
          "key1": "val1",
          "key2": "val2"
        },
        {
          "key1": "val5",
          "key2": "val6"
        }
      ],
      "anotherlist": [
        {
          "key1": "val13",
          "key2": "val14"
        },
        {
          "key1": "val11",
          "key2": "val12"
        },
        {
          "key1": "val11",
          "key2": "val12"
        },
        {
          "key1": "val11",
          "key2": "val12"
        }
      ]
    },
    {
      "common": "val1",
      "list": [
        {
          "key1": "val9",
          "key2": "val10"
        },
        {
          "key1": "val9",
          "key2": "val10"
        }
      ],
      "anotherlist": [
        {
          "key1": "val11",
          "key2": "val12"
        },
        {
          "key1": "val13",
          "key2": "val14"
        }
      ]
    }
  ]
}

而我期望的Json是：

{
  "output": [
    {
      "common": "val0",
      "list": [
        {
          "key1": "val5",
          "key2": "val6"
        },
        {
          "key1": "val3",
          "key2": "val4"
        },
        {
          "key1": "val1",
          "key2": "val2"
        }
      ],
      "anotherlist": [
        {
          "key1": "val13",
          "key2": "val14"
        },
        {
          "key1": "val11",
          "key2": "val12"
        }
      ]
    },
    {
      "common": "val1",
      "list": [
        {
          "key1": "val9",
          "key2": "val10"
        }
      ],
      "anotherlist": [
        {
          "key1": "val11",
          "key2": "val12"
        },
        {
          "key1": "val13",
          "key2": "val14"
        }
      ]
    }
  ]
}

提前感谢您对如何获得上述预期JSON的任何建议。