Oracle 分组统计，按照天、月份周和自然周、月、季度和年

-- 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;

-- 按自然周的日期统计 
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,'YYYY-MM-DD')
ORDER BY 周;

-- 按自然周统计 
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;

-- 按自然月统计 
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,'q')
ORDER BY 季度 NULLS  LAST;

--按年统计 
select to_char(t.CREATED,'yyyy') AS 年度,'yyyy')
ORDER BY 年度;

（编辑：李大同）

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