sqlserver周次,sql 周

sqlserver怎么获得最后一周,最近一月的日期

1、最近一月比较简单,取当前时间的年份和月份,拼接成当前月份1号。

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2、最后一周:取当前的时间为参考,用datepart取出时间的周编号,进行筛选,获取最近周1的日期,比如,表格a,日期字段rq

select max(rq) from 表格a 

where datepart(weekday,rq) = 2 and rq  当前时间 按到 rq  本月1号;

sqlserver怎么按周来统计数据

指定一个起始日,计算到该日的天数,/7 得到经过的周数。然後按这个周数分组。

SQL统计双休日

select Inspect_name,

A=sum(A), B=sum(B),双休日=sum(case when 双休日 = 2 then 1 else 0 end)

from

(

select weekly,Inspect_name,

A=sum(A), B=sum(B),双休日=sum(case when 双休日119 then 1 else 0 end)

from

(

select weekly, Inspect_name, vdatetime2,

sum(case when rank= 'A' then 1 else 0 end) A,

sum(case when rank= 'B' then 1 else 0 end) B,

SUM(CASE WHEN xxx = '休' THEN vtime ELSE 0 END) AS 双休日

from

(

select datepart(wk,(case when convert(varchar(16),vdatetime2,120) between convert(varchar(10),vdatetime2,120)+' 00:00' and convert(varchar(10),vdatetime2,120)+' 05:01' then vdatetime2 -1

else vdatetime2 end)) as weekly,Inspect_name, rank,

(case when convert(varchar(16),vdatetime2,120) between convert(varchar(10),vdatetime2,120)+' 00:00' and convert(varchar(10),vdatetime2,120)+' 05:01' then convert(varchar(10),vdatetime2 -1,120)

else convert(varchar(10),vdatetime2,120) end) as vdatetime2,

( CASE WHEN(datepart(dw, vdatetime2)=6 AND CONVERT(VARCHAR(8),vdatetime2,108)'23:00') OR (datepart(dw, vdatetime2)=7 )or (datepart(dw, vdatetime2)=1 ) OR(datepart(dw, vdatetime2)=2 AND CONVERT(VARCHAR(8),vdatetime2,108) '04:59')THEN '休' ELSE '不休' END) as 'xxx',

vtime

from tb

) t

group by weekly,Inspect_name, vdatetime2

) Tbl

group by weekly,Inspect_name

) tbl1

group by Inspect_name

DATEPART(ww,DATE) 函数计算的周次讲解:

这个函数是以周日为每个周次的第一天,所以你要实现周一为每周的开始必须这样书写才能实现

DATEPART(ww,DATE-1)

sqlserver语句,按周分组统计数据,请各位大神指教小弟。

---把getdate()替换成你的日期字段就可以了, between and的2个日期分别是你说的2个年头年尾的情况

select case when getdate()=cast('2014/1/1' as datetime) then datepart(week,getdate()) else 1 end as 第几周

--from table_name

where getdate() between (case when datepart(weekday,cast('2014/1/1' as datetime))1 then

cast('2014/1/1' as datetime)-datepart(weekday,cast('2014/1/1' as datetime))+2

end )

and

(case when datepart(weekday,cast('2014/12/31' as datetime))6 then

cast('2014/12/31' as datetime)-datepart(weekday,cast('2014/12/31' as datetime))+1

end )

sqlserver如何设置周一作为起始周次

你这个涉及"mssql sqlserver set datefirst关键字的用法简介"

请仔细了解此函数的用法就可以了,如有疑问,及时沟通!


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