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CREATE TABLE mytable( Event INTEGER NOT NULL PRIMARY KEY ,Start_Time TIME NOT NULL ,End_Time TIME NOT NULL ); INSERT INTO mytable(Event,Start_Time,End_Time) VALUES (1,'12:03','14:20'); INSERT INTO mytable(Event,Start_Time,End_Time) VALUES (2,'12:30','12:50'); INSERT INTO mytable(Event,Start_Time,End_Time) VALUES (3,'13:05','14:45'); INSERT INTO mytable(Event,Start_Time,End_Time) VALUES (4,'14:01','14:49');
select hr, sum(sum(cnt)) over(order by hr) cnt from ( select hour(start_time) hr, 1 cnt from mytable union all select hour(end_time) + 1, -1 from mytable ) t group by hr
hr
cnt
12
2
13
2
14
3
15
0