SQL - Group several lines in the same column with LIST TAG
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SELECT country,
listagg(first_name, ', ') WITHIN GROUP (order by first_name)
FROM tablename
GROUP BY country
To avoid to have issue with too long string concatenantion, this is a nice workaround :
with PRECALC
as (select
floor(4000/(max(length(MY_COLUMN)+LENGTH(',')))) as MAX_FIELD_LENGTH
from MY_TABLE)
select LISTAGG(MY_COLUMN,',')
WITHIN GROUP(ORDER BY floor(rownum/MAX_FIELD_LENGTH), MY_COLUMN)
from MY_TABLE, PRECALC
group by floor(rownum/MAX_FIELD_LENGTH);