UNION Tables MySQL and output into JSON Array - mysql

Question

I need some help on MySQL Query for UNION multiple Tables and group the result by ID and output the result in JSON_ARRAY. I have referred to this but I can't get the output as I want because my query need to UNION tables.
SELECT
JSON_ARRAYAGG(JSON_OBJECT(
'_CODE', a._CODE,
'_USERID', a._USERID,
'_NAME', c._NAME,
'HAHA',
(SELECT JSON_ARRAY(JSON_OBJECT(
'_CAT', b._CAT,
'_MODEL', b._MODEL,
'_SERIAL', b._SERIAL,
'_IPADDR', b._IPADDR,
'_OS', (SELECT _DESC
FROM kod_produk
WHERE _CODE = (SELECT _PROD
FROM inventori_dt3
WHERE _CODE = a._CODE
AND _CAT = '15'
AND _SERIAL = b._SERIAL)),
'_AV', (SELECT CONCAT(_DESC,
' (',
(CASE WHEN(SELECT _CODE
FROM inventori_dt3
WHERE _CODE = a._CODE
AND _CAT = '16'
AND _EXPY_DATE > NOW())
IS NOT NULL
THEN
'AKTIF'
ELSE
'TAMAT'
END), ')')
FROM kod_produk
WHERE _CODE = (SELECT _PROD
FROM inventori_dt3
WHERE _CODE = a._CODE
AND _CAT = '16'
AND _SERIAL = b._SERIAL))
)))
)) Z
FROM
inventori_mt a
LEFT JOIN
(
SELECT _CODE, _CAT, _MODEL, _SERIAL, _IPADDR FROM inventori_dt1
UNION ALL
SELECT _CODE, _CAT, _MODEL, _SERIAL, _IPADDR FROM inventori_dt2
) b ON a._CODE = b._CODE
LEFT JOIN
sys_pengguna c ON a._USERID = c._USERID
Table design
Pastebin
Expected Result
Actual Output Result
DB-Fiddle
Sample DB

Answer 1

Need to use JSON_ARRAY() with JSON_ARRAYAGG() within the subquery, and use GROUP BY expression within the one level outer query with JSON_OBJECT() function at topmost of this query in order to get each individual grouped, and nested objects. And apply JSON_ARRAYAGG() at the outermost level in order to aggregate all those independent JSON object pieces. So, use :
SELECT JSON_PRETTY( JSON_ARRAYAGG(Z) ) AS Z
FROM
(
SELECT
JSON_OBJECT(
'_CODE', a._CODE,
'_USERID', a._USERID,
'_NAME', c._NAME,
'HAHA',
(SELECT
JSON_ARRAYAGG(
JSON_OBJECT(
'_CAT', b._CAT,
'_MODEL', b._MODEL,
'_SERIAL', b._SERIAL,
'_IPADDR', b._IPADDR ,
'_OS', (SELECT _DESC
FROM kod_produk
WHERE _CODE = (SELECT _PROD
FROM inventori_dt3
WHERE _CODE = a._CODE
AND _CAT = '15'
AND _SERIAL = b._SERIAL)),
'_AV', (SELECT CONCAT(_DESC,
' (',
(CASE WHEN(SELECT _CODE
FROM inventori_dt3
WHERE _CODE = a._CODE
AND _CAT = '16'
AND _EXPY_DATE > NOW())
IS NOT NULL
THEN
'AKTIF'
ELSE
'TAMAT'
END), ')')
FROM kod_produk
WHERE _CODE = (SELECT _PROD
FROM inventori_dt3
WHERE _CODE = a._CODE
AND _CAT = '16'
AND _SERIAL = b._SERIAL))
)
)
)
) Z
FROM inventori_mt a
LEFT JOIN
(
SELECT _CODE, _CAT, _MODEL, _SERIAL, _IPADDR FROM inventori_dt1
UNION ALL
SELECT _CODE, _CAT, _MODEL, _SERIAL, _IPADDR FROM inventori_dt2
) b
ON a._CODE = b._CODE
LEFT JOIN sys_pengguna c
ON a._USERID = c._USERID
GROUP BY a._CODE, a._USERID, c._NAME
) q
Demo