coba gunakan TIMEDIFF( ) dan subkueri
SELECT TIMEDIFF((SELECT `entered_at` FROM `demo_test3` WHERE `id`='1'),
(SELECT `entered_at` FROM `demo_test3` WHERE `id`='3'))
coba gunakan TIMEDIFF( ) dan subkueri
SELECT TIMEDIFF((SELECT `entered_at` FROM `demo_test3` WHERE `id`='1'),
(SELECT `entered_at` FROM `demo_test3` WHERE `id`='3'))