Answer Posted / prathibha

select customer_id,

MAX(CASE WHEN RNK MOD 8 = 1 THEN ACCOUNT_NO ELSE '' END) ||
MAX(CASE WHEN RNK MOD 8 = 2 THEN ',' || ACCOUNT_NO ELSE '' END) ||
MAX(CASE WHEN RNK MOD 8 = 3 THEN ',' || ACCOUNT_NO ELSE '' END)
AS ACCOUNT_NO
FROM
(
select customer_id,account_no, rank() over (partition by customer_id order by account_no) as rnk
from customer_account ) TEMP
GROUP BY 1


The above query is tested and it works.

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