-- ouput
-- john,peter,raja,Peter
select
group_concat(first_name)
from
user_info;
-- output
-- john,peter,raja
group_concat(
DISTINCT
username)
-- john|peter|raja|Peter
group_concat(username SEPARATOR
"|"
)
-- john|peter|Peter|raja
group_concat(username
ORDER
BY
username
desc
SEPARATOR
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