LISTAGG Query ORA-00937:bukan fungsi grup grup tunggal

Saya pikir agar kueri Anda berfungsi, Anda perlu menambahkan group by , ubah order by . Anda juga harus menggunakan sintaks gabungan eksplisit yang tepat:

SELECT r.rule_id as RULE_ID, 
       LISTAGG(a.ATTRIBUTE_ID, ', ') WITHIN GROUP (ORDER BY a.ATTRIBUTE_ID) as "ATTR_IDS"
FROM N_RULE r JOIN
     N_ATTRIBUTE a 
     ON r.RULE_ID = a.RULE_ID 
GROUP BY r.rule_id
ORDER BY r.rule_id;

Atau, mungkin Anda ingin menyertakan atribut lain dalam hasil:

SELECT r.rule_id, r.AUDIENCE, UPPER(r.NAME) 
       LISTAGG(a.ATTRIBUTE_ID, ', ') WITHIN GROUP (ORDER BY a.ATTRIBUTE_ID) as "ATTR_IDS"
FROM N_RULE r JOIN
     N_ATTRIBUTE a 
     ON r.RULE_ID = a.RULE_ID 
GROUP BY r.rule_id, r.AUDIENCE, UPPER(r.NAME)
ORDER BY r.AUDIENCE, UPPER(r.NAME);