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training_duration view

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This commit is contained in:
Riccardo Berto 2021-03-01 13:38:11 +01:00
parent 6422fff894
commit a257a08760
1 changed files with 26 additions and 1 deletions
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27
init.sql
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@ -20,4 +20,29 @@ create table if not exists training_data(
constraint fk_training_id foreign key(training_id) references training(id) on delete cascade
);
create index if not exists idx_training_data_t on training_data(t);
create index if not exists idx_training_data_geog on training_data using GIST(geog);
create index if not exists idx_training_data_geog on training_data using GIST(geog);
create or replace view training_duration as
(select td_start.id as id,
td_start.t as start_time,
td_end.t as end_time,
date_trunc('second', (td_end.t - td_start.t)) as duration
from (select td_row_n.t, td_row_n.id
from (select *,
row_number() over (partition by td.training_id order by td.t asc) as row_n
from training_data td join training t on (t.id = td.training_id)
order by td.t asc) as td_row_n
where td_row_n.row_n = 1
order by td_row_n.t asc) td_start
join
(select td_row_n.t, td_row_n.id
from (select *,
row_number() over (partition by td.training_id order by td.t desc) as row_n
from training_data td join training t on (t.id = td.training_id)
order by td.t asc) as td_row_n
where td_row_n.row_n = 1) td_end
on (td_start.id = td_end.id)
);