// 현재 달
SELECT DATE_FORMAT(from_unixtime(regdate), '%Y-%m-%d %H:%i:%s')
FROM TEST
WHERE
DATE_FORMAT(from_unixtime(regdate), '%Y%m') = DATE_FORMAT(from_unixtime(regdate), '%Y%m')
// 200707
SELECT DATE_FORMAT(from_unixtime(regdate), '%Y-%m-%d %H:%i:%s')
FROM TEST
WHERE
DATE_FORMAT(from_unixtime(regdate), '%Y%m') = '200707'
// 200707 ~ 200708 포함
SELECT DATE_FORMAT(from_unixtime(regdate), '%Y-%m-%d %H:%i:%s')
FROM TEST
WHERE
DATE_FORMAT(from_unixtime(regdate), '%Y%m') BETWEEN '200707' AND '200708'