PostgreSQL实现按年、月、日、周、时、分、秒的分组统计

select to_char(date::DATE, ‘YYYY’) as year,sum(shares) as shares, sum(visits) as visits
from database_table
where date >=’2019-01-01′ and date <=’2020-01-01′ group by year order by year

select to_char(date::DATE, ‘YYYY-MM’) as month,sum(shares) as shares, sum(visits) as visits
from database_table
where date >=’2019-01-01′ and date <=’2020-01-01′ group by month order by month

select to_char(date::DATE-(extract(dow from date::TIMESTAMP)-1||’day’)::interval, ‘YYYY-mm-dd’) week,
sum(shares) as shares, sum(visits) as visits
from database_table
where date >=’2019-01-01′ and date <=’2020-01-01′ group by week order by week

select to_char(date::DATE, ‘YYYY-MM-DD’) as day,sum(shares) as shares, sum(visits) as visits
from database_table
where date >=’2019-01-01′ and date <=’2020-01-01′ group by day order by day

select to_char(date::DATE, ‘YYYY-MM-DD HH24′) as hour,sum(shares) as shares, sum(visits) as visits
from database_table
where date >=’2019-01-01′ and date <=’2020-01-01’ group by hour order by hour

select to_char(date::DATE, ‘YYYY-MM-DD HH24:MI ‘) as minute,sum(shares) as shares, sum(visits) as visits
from database_table
where date >=’2019-01-01′ and date <=’2020-01-01’ group by minute order by minute

select to_char(date::DATE, ‘YYYY-MM-DD HH24:MI:SS ‘) as second,sum(shares) as shares, sum(visits) as visits
from database_table
where date >=’2019-01-01′ and date <=’2020-01-01’ group by second order by second

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