SELECT
    *
FROM
    SLEEP_TIME_DTL AS STD
INNER JOIN
    SLEEP_TIME_DTL AS STD_120 ON STD_120.TIME_CODE = STD.TIME_CODE AND STD_120.TIME_CODE = STD.AGE_CODE
GROUP BY
    STD.AGE_CODE, STD.TIME_CODE
ORDER BY
    STD.AGE_CODE
;