sql server依据日期或者月份查询聚合数据
/*****************************根据时间查询每天的数据***************************************/
@tm_start:开始时间
@tm_end：结束时间
sql语句：
Select CONVERT(DATE, c.dt_rec) DT,COUNT(*) CT
From dbo.YY_client c
where c.dt_rec between CONVERT(varchar(50),@tm_start,20) and CONVERT(varchar(50),@tm_end,20)
Group by CONVERT(DATE, c.dt_rec) Order by CONVERT(DATE, c.dt_rec) desc
结果：
/*****************************按照时间查询每月的数据***************************************/
sql语句：
SELECT (CAST(YEAR(c.dt_rec) AS VARCHAR(4)) + '-' + CAST(MONTH(c.dt_rec) AS VARCHAR(2))) DT, COUNT(*) CT
From dbo.YY_client c
WHERE c.dt_rec between @tm_start and @tm_end
GROUP BY (CAST(YEAR(c.dt_rec) AS VARCHAR(4)) + '-' + CAST(MONTH(c.dt_rec) AS VARCHAR(2)))
ORDER BY (CAST(YEAR(c.dt_rec) AS VARCHAR(4)) + '-' + CAST(MONTH(c.dt_rec) AS VARCHAR(2))) DESC
结果：