Question

我想进行查询以给出结果，如果有重复的ID，它将被分组，并且下面的数据将完整地保留到相同的分组数据中，并且全部在数组JSON数据中。

我这样查询：

Traceback (most recent call last):
  File "C:\Program Files\Python37\lib\site-packages\pygame\_camera_vidcapture.py", line 31, in init
    import vidcap as vc
ModuleNotFoundError: No module named 'vidcap'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<pyshell#2>", line 1, in <module>
    pygame.camera.init()
  File "C:\Program Files\Python37\lib\site-packages\pygame\camera.py", line 69, in init
    _camera_vidcapture.init()
  File "C:\Program Files\Python37\lib\site-packages\pygame\_camera_vidcapture.py", line 33, in init
    from VideoCapture import vidcap as vc
ModuleNotFoundError: No module named 'VideoCapture'

结果如下。

SELECT json_build_object(
    'nama_perusahaan',"a"."nama_perusahaan",
    'proyek', json_build_object(
        'no_izin',"b"."no_izin",
        'kode',c.kode,
        'judul_kode',d.judul
    )
)
FROM "t_pencabutan" "a"
LEFT JOIN "t_pencabutan_non" "b" ON "a"."id_pencabutan" = "b"."id_pencabutan"
LEFT JOIN "t_pencabutan_non_b" "c" ON "b"."no_izin" = "c"."no_izin"
LEFT JOIN "t_pencabutan_non_c" "d" ON "c"."id_proyek" = "d"."id_proyek"

我期望的是这样。

{
    "nama_perusahaan" : "JASA FERRIE", 
    "proyek" : 
    {
        "no_izin" : "26A/E/IU/PMA/D8FD", 
        "kode" : "14302", 
        "judul_kode" : "IND"
    }
}
{
    "nama_perusahaan" : "JASA FERRIE", 
    "proyek" : 
    {
        "no_izin" : "26A/E/IU/PMA/D8FD", 
        "kode" : "13121", 
        "judul_kode" : "IND B"
    }
}

我该如何进行查询？

Answer 1

您需要打开聚合，并使用json_agg()生成正确的数据结构。

这应该接近您想要的：

SELECT json_build_object(
    'nama_perusahaan',"a"."nama_perusahaan",
    'proyek', json_agg(
            json_build_object(
            'no_izin',"b"."no_izin",
            'kode',c.kode,
            'judul_kode',d.judul
        )
    )
)
FROM "t_pencabutan" "a"
LEFT JOIN "t_pencabutan_non" "b" ON "a"."id_pencabutan" = "b"."id_pencabutan"
LEFT JOIN "t_pencabutan_non_b" "c" ON "b"."no_izin" = "c"."no_izin"
LEFT JOIN "t_pencabutan_non_c" "d" ON "c"."id_proyek" = "d"."id_proyek"
GROUP BY "a"."nama_perusahaan"

如何按重复值分组并嵌套数组Postgresql

1 个答案: