oracle 月份有几周,Oracle 分组统计，按照天、月份周和天然周、月、季度和年

作报表统计时会常常用到 周，月，季度，年进行分组统计，因此结合网络搜索推荐的sql，总结以下：

-- 按天统计

select to_char(t.CREATED+15/24, 'YYYY-MM-DD') as 天,sum(1) as 数量

from TB_EXT_TRADE t

WHERE

t.TID LIKE 'SC%' OR t.TID LIKE 'WSC%'

group by to_char(t.CREATED+15/24, 'YYYY-MM-DD') --trunc(t.CREATED, 'DD')

ORDER by 天 NULLS LAST;

-- 按天然周的日期统计

select to_char(next_day(t.CREATED+15/24 - 7,2),'YYYY-MM-DD') AS 周,sum(1) as 数量

from TB_EXT_TRADE t

WHERE

t.TID LIKE 'SC%' OR t.TID LIKE 'WSC%'

group by to_char(next_day(t.CREATED+15/24 - 7,2),'YYYY-MM-DD')

ORDER BY 周;

-- 按天然周统计

select to_char(t.CREATED,'iw') AS 周,sum(1) as 数量

from TB_EXT_TRADE t

WHERE

t.TID LIKE 'SC%' OR t.TID LIKE 'WSC%'

group by to_char(t.CREATED,'iw')

ORDER BY 周;

-- 按天然月统计

select to_char(t.CREATED,'YYYY-MM') as 月份,sum(1) as 数量

from TB_EXT_TRADE t

WHERE

t.TID LIKE 'SC%' OR t.TID LIKE 'WSC%'

GROUP BY

to_char(t.CREATED,'YYYY-MM') -- to_char(t.CREATED+15/24,'yyyy-mm') 不大准确

ORDER BY 月份;

-- 按季统计

select to_char(t.CREATED,'q') 季度,sum(1) as 数量

from TB_EXT_TRADE t

WHERE

t.TID LIKE 'SC%' OR t.TID LIKE 'WSC%'

group by to_char(t.CREATED,'q')

ORDER BY 季度 NULLS LAST;

--按年统计

select to_char(t.CREATED,'yyyy') AS 年度,sum(1) as 数量

from TB_EXT_TRADE t

WHERE

t.TID LIKE 'SC%' OR t.TID LIKE 'WSC%'

group by to_char(t.CREATED,'yyyy')

ORDER BY 年度;