SQL Server按照时间统计

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1.统计某一年内，0-24时内各时段流量，用到了DATEPART()函数，可以以任意时间单位为

select year(ACTION_TIME) '年',  
DATEPART(hh,ACTION_TIME) '时',   
COUNT(DISTINCT ACTION_USER_ID) userNum  
from ACTION_LOG  
where ACTION_TIME BETWEEN  '2017-01-01 00:00:01' AND '2018-12-01 00:00:01' 
group by year(ACTION_TIME),  
DATEPART(hh,ACTION_TIME)  ORDER BY  year(ACTION_TIME),DATEPART(hh,ACTION_TIME) 

DATEPART（a，b）函数a参数可以为以下值

2.某段时间内每一天的交易额，以年、月、日为独立单位

------------ORDER_INFO：表名,ORDER_TIME：下单时间，ORDER_AMOUNT：订单金额
select year(ORDER_TIME) '年',  month(ORDER_TIME) '月',  
day(ORDER_TIME) '日',  SUM(ORDER_AMOUNT) userNum  
from ORDER_INFO  
where ORDER_TIME BETWEEN  
'2018-11-01 00:00:01' AND '2018-12-01 00:00:01' 
group by year(ORDER_TIME),  month(ORDER_TIME),  day(ORDER_TIME)