動態獲取weekStart和weekEnd？

Question

我花了很多時間試圖弄清楚如何做到這一點，但做不到。所以請幫助我。

我有這樣的數據：

ID employee_id  worked_date  start_time  finish_time 
1  1   2013-09-25  09:00:00 17:30:00 
2  1   2013-09-26  07:00:00 17:00:00 
8  1   2013-10-01  09:00:00 17:00:00 
9  1   2013-10-04  09:00:00 17:00:00 
12 1   2013-10-07  09:00:00 17:00:00 
13 1   2013-10-10  09:00:00 17:00:00 
14 1   2013-10-11  09:00:00 17:00:00 

我一週的第一天是星期三。基準日期是2013年9月25日星期三。我需要能夠動態地獲取weekStart和weekEnd。例如，根據我上面提供的數據，2013年9月25日至2013年10月11日之間有三個星期。我先用最新的working_date命令我的數據。如果用戶請求第3周，則weekStart應爲2013-09-25，並且weekEnd應爲2013-10-01。如果用戶請求week2，那麼weekStart應該是2013-10-02到2013-10-08等等。

參數week將被動態傳遞。謝謝你的幫助。

這裏是我想要實現時所要求的每週3結果：

ID employee_id  worked_date  start_time  finish_time weekStart weekEnd 
1  1   2013-09-25  09:00:00 17:30:00  2013-09-25 2013-10-01 
2  1   2013-09-26  07:00:00 17:00:00  2013-09-25 2013-10-01 
8  1   2013-10-01  09:00:00 17:00:00  2013-09-25 2013-10-01 

使用該查詢會給我weekStart和週末爲每個記錄

SELECT *, dateadd(week, datediff(day,'20000105',worked_date)/7, '20000105') AS WeekStart , 
      dateadd(week, datediff(day,'20000105',worked_date)/7, '20000105') + 6 AS WeekEnd 
FROM Timesheet 

但我不想要這個。我只需要用戶請求的特定周。

Answer 1

這聽起來像你可能需要一個日曆表。

create table calendar (
calendarId int identity(1,1) primary key, 
year int, 
month int, 
week int, 
startDate date, 
endDate date) 

那麼你可以說「給我所有的記錄，每週2」

declare @week int = 2 
declare @year int = 2013 

;with employeeCalendar as (
    select 
    employee.employeeid 
    ,startDate 
    ,endDate 
    from 
    employee 
    cross apply 
    calendar 
    where 
    calendar.week = @week) 
select 
    employeeCalendar.EmployeeId 
,employeeShift.[date] 
,start_time 
,finish_time 
,startDate 
,endDate 
from 
    employeeCalendar 
left join 
    employeeShift 
on employeeShift.employeeid = employeeCalendar.employeeid 
and employeeShift.worked_date 
between employeeCalendar.startDate and employeeCalendar.endDate 

您可以填寫該表，像這樣的查詢：

;with calendarCte as (
select 
    1 as week 
,convert(date,'2013-09-25') as startDate 
,convert(date,'2013-10-01') as endDate 
union all 
select 
    week + 1 
,dateadd(week,1,startDate) 
,dateadd(week,1,endDate) 
from 
    calendarCte 
where 
    calendarCte.startDate < convert(date,'2043-09-25')) 
insert into calendar([year],[month],[week],startdate,stopdate) 
select 
    datepart(year,startDate) as [year] 
,datepart(month,startDate) as [month] 
,week as [week] 
,startDate 
,endDate 
from calendarCte option (maxrecursion 0) 

Answer 2

你說你是尋找一個存儲過程。你在找這樣的東西嗎？

CREATE PROCEDURE ProcedureName @week int AS 

SELECT * FROM Timesheet 
WHERE worked_date >= dateadd(week, @week, '2013-09-25') 
AND worked_date < dateadd(day,7,dateadd(week, @week, '2013-09-25')) 

如果你想要你的weekStart和weekEnd，你可以像你以前那樣將它們添加到SELECT中。

如果您想從當前的星期的降序到後退，您可以按如下方式編寫它。

CREATE PROCEDURE ProcedureName @week int AS 

SELECT * FROM Timesheet 
WHERE worked_date >= dateadd(week, -@week, '2013-10-16') 
AND worked_date < dateadd(day,7,dateadd(week, -@week, '2013-10-16')) 

你也可以參數要傳遞到存儲過程作爲當前星期總是會改變的日期。