SURVEY_TAKER_ID with "Question_Number: RESPONSE" style concating:
SELECT SURVEY_TAKER_ID
,GROUP_CONCAT(CONCAT(QUESTION_NUMBER, ': ', RESPONSE) ORDER BY QUESTION_NUMBER SEPARATOR ', ') AS RESPONSES
FROM Table1
GROUP BY SURVEY_TAKER_ID
ORDER BY SURVEY_TAKER_ID
.
SURVEY_TAKER_ID with "RESPONSE" alone style concating:
SELECT SURVEY_TAKER_ID
,GROUP_CONCAT(RESPONSE ORDER BY QUESTION_NUMBER SEPARATOR ', ') AS RESPONSES
FROM Table1
GROUP BY SURVEY_TAKER_ID
ORDER BY SURVEY_TAKER_ID