SQLServer 按日/周 統計數據條數

--按日統計
SELECT CONVERT(VARCHAR(10),日期列,120) AS days,COUNT(1) AS totalCount FROM 表 GROUP BY CONVERT(VARCHAR(10),日期列,120) ORDER BY days

--按周統計
select datepart(week, 日期列) AS weekCount, sum(1) AS totalCount from 表 group by datepart(week, 日期列) ORDER BY weekCount