intervalLengthSum

CREATE TABLE fl_interval (id String, start Float32, end Float32) ENGINE = Memory;
INSERT INTO fl_interval VALUES ('a', 1.1, 2.9), ('a', 2.5, 3.2), ('a', 4, 5);

SELECT id, intervalLengthSum(start, end), toTypeName(intervalLengthSum(start, end)) FROM fl_interval GROUP BY id ORDER BY id;

┌─id─┬─intervalLengthSum(start, end)─┬─toTypeName(intervalLengthSum(start, end))─┐
│ a  │            3.0999999046325684 │ Float64                                   │
└────┴───────────────────────────────┴───────────────────────────────────────────┘

CREATE TABLE dt_interval (id String, start DateTime, end DateTime) ENGINE = Memory;
INSERT INTO dt_interval VALUES ('a', '2020-01-01 01:12:30', '2020-01-01 02:10:10'), ('a', '2020-01-01 02:05:30', '2020-01-01 02:50:31'), ('a', '2020-01-01 03:11:22', '2020-01-01 03:23:31');

SELECT id, intervalLengthSum(start, end), toTypeName(intervalLengthSum(start, end)) FROM dt_interval GROUP BY id ORDER BY id;

┌─id─┬─intervalLengthSum(start, end)─┬─toTypeName(intervalLengthSum(start, end))─┐
│ a  │                          6610 │ UInt64                                    │
└────┴───────────────────────────────┴───────────────────────────────────────────┘

CREATE TABLE date_interval (id String, start Date, end Date) ENGINE = Memory;
INSERT INTO date_interval VALUES ('a', '2020-01-01', '2020-01-04'), ('a', '2020-01-12', '2020-01-18');

SELECT id, intervalLengthSum(start, end), toTypeName(intervalLengthSum(start, end)) FROM date_interval GROUP BY id ORDER BY id;

┌─id─┬─intervalLengthSum(start, end)─┬─toTypeName(intervalLengthSum(start, end))─┐
│ a  │                             9 │ UInt64                                    │
└────┴───────────────────────────────┴───────────────────────────────────────────┘