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WITH yourTable AS ( SELECT '23:00:00' AS start_time, '19:00:00' AS end_time UNION ALL SELECT '23:00:00', '07:00:00' ) SELECT start_time, end_time, 24 + DATEDIFF(HOUR, start_time, end_time) AS diff_in_hours FROM yourTable;
start_time
end_time
diff_in_hours
23:00:00
19:00:00
20
23:00:00
07:00:00
8