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init.sql
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@ -23,39 +23,31 @@ create index if not exists idx_training_data_t on training_data(t);
create index if not exists idx_training_data_training_id on training_data(training_id); create index if not exists idx_training_data_training_id on training_data(training_id);
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 function resolve_geo_location(geography) returns text as $$
begin
case when st_dwithin($1, st_point(45.516114, 9.216108), 500) then
return 'Bicocca';
else
return 'unknown';
end case;
end
$$ language plpgsql immutable;
create or replace view training_duration as create or replace view training_duration as
( (select td_start.id as id,
select td_start.geog as start_location,
td_start.training_id as training_id, td_end.geog as end_location,
td_start.t as start_time, td_start.t as start_time,
td_end.t as end_time, td_end.t as end_time,
resolve_geo_location(td_start.geog) AS start_location, date_trunc('second', (td_end.t - td_start.t)) as duration
resolve_geo_location(td_end.geog) AS end_location, from (select td_row_n.t, td_row_n.id, td_row_n.geog
td_start.geog as start_location_point, from (select *,
td_end.geog as end_location_point, row_number() over (partition by td.training_id order by td.t asc) as row_n
date_trunc('second'::text, td_end.t - td_start.t) AS duration from training_data td join training t on (t.id = td.training_id)
from order by td.t asc) as td_row_n
( where td_row_n.row_n = 1
select distinct on (td2.training_id) * order by td_row_n.t asc) td_start
from training_data td2 order by td2.training_id, t asc
) td_start join
join
( (select td_row_n.t, td_row_n.id, td_row_n.geog
select distinct on (td2.training_id) * from (select *,
from training_data td2 order by td2.training_id, t desc row_number() over (partition by td.training_id order by td.t desc) as row_n
) td_end from training_data td join training t on (t.id = td.training_id)
on (td_start.training_id = td_end.training_id) order by td.t asc) as td_row_n
order by td_start.t asc where td_row_n.row_n = 1) td_end
on (td_start.id = td_end.id)
); );
create or replace view training_info as create or replace view training_info as