mysql中用法：

GROUP_CONCAT(qua.user_answer SEPARATOR '!,');

达梦中用法：

replace(WM_CONCAT(qua.user_answer ),',', '!,')

--使用listagg函数替代
SELECT task_id AS taskId,
listagg(col_name) within group(order by col_name desc) AS colNames
FROM xxx
WHERE 1 = 1
AND id = 0
AND task_id LIKE '%str%'
AND create_time LIKE '%str%'
GROUP BY task_id, data_uuid
ORDER BY task_id, data_uuid

--使用wm_concat函数替代
SELECT task_id AS taskId,
wm_concat(col_name) AS colNames
FROM xxx
WHERE 1 = 1
AND id = 0
AND task_id LIKE '%str%'
AND create_time LIKE '%str%'
GROUP BY task_id, data_uuid
ORDER BY task_id, data_uuid