Помогите решить задачку:

create temp table t_logs
(
query_finish timestamp,
session_id int,
cpu_elapsed int,
comment varchar(100)
)on commit preserve rows;
commit;

COMMENT ON TABLE t_logs IS 'Таблица с логами работы ETL';
COMMENT ON COLUMN t_logs.query_finish IS 'Время окончания работы запроса';
COMMENT ON COLUMN t_logs.session_id IS 'Уникальный идентификатор сессии';
COMMENT ON COLUMN t_logs.cpu_elapsed IS 'Затраченное cpu на сессию (накопительно)';
COMMENT ON COLUMN t_logs.comment IS 'Комментарий';

insert into t_logs values('2019-11-29 09:31:51', 97367, 2500, 'insert period 4');
insert into t_logs values('2019-11-29 09:30:43', 97367, 1940, 'insert period 3');
insert into t_logs values('2019-11-29 09:29:32', 97367, 1820, 'insert period 2');
insert into t_logs values('2019-11-29 09:28:34', 97367, 860 , 'insert period 1');
insert into t_logs values('2019-11-29 08:57:33', 87081, 3050, 'insert period 6');
insert into t_logs values('2019-11-29 08:54:39', 87081, 2810, 'insert period 5');
insert into t_logs values('2019-11-29 08:51:48', 87081, 2690, 'insert period 4');
insert into t_logs values('2019-11-29 08:49:10', 87081, 2600, 'insert period 3');
insert into t_logs values('2019-11-29 08:46:34', 87081, 2510, 'insert period 2');
insert into t_logs values('2019-11-29 08:40:28', 87081, 2420, 'insert period 1');
insert into t_logs values('2019-11-29 08:18:34', 87081, 2240, 'create table');
commit;