Raccomando grouping sets :
select coalesce(location, 'Total') as location,
coalesce(home_team_name, 'Total') as home_team_name,
sum(case when match_date >= date '2018-01-01' and
match_date < date '2018-02-01'
then 1 else 0
end) as january_2018,
sum(case when match_date >= date '2018-02-01' and
match_date < date '2018-03-01'
then 1 else 0
end) as february_2018,
sum(case when match_date >= date '2018-03-01' and
match_date < date '2018-04-01'
then 1 else 0
end) as march_2018,
sum(case when match_date >= date '2018-01-01' and
match_date < date '2019-01-01'
then 1 else 0
end) as total_2018
from match_results
group by grouping sets ( (location, home_team_name), () );
Cioè, ripetere la query non è necessario. Ho anche modificato i confronti delle date per utilizzare le date effettive. Lo trovo più leggibile e gestibile rispetto all'estrazione di parti di data.
