如何在SQL Server中包括一周中最后一天的小时数

Question

I am writing this query:

SELECT 
    DATEADD(wk, DATEDIFF(wk, 0, vr_EmployeeLog.DateTimeStart), 0) period_start,
    DATEADD(wk, DATEDIFF(wk, 0, vr_EmployeeLog.DateTimeStart), 6) period_end 
FROM
    vr_EmployeeLog

I am getting the result:

period_start   2015-10-12 00:00:00.000
period end     2015-10-18 00:00:00.000

but I got records for period_end date 2015-10-18 01:56:00.000 AM and its not including in the result.

How can I achieve this?

Answer 1

Try using days instead of weeks.

SELECT 
    DATEADD(wk,DATEDIFF(wk,0,vr_EmployeeLog.DateTimeStart),0) period_start,
    DATEADD(day,DATEDIFF(day,0,vr_EmployeeLog.DateTimeStart),7) period_end         
FROM vr_EmployeeLog

But to choose data via a "date range" use a combination of greater than or equal to then less then (the next day)

SELECT *
FROM vr_EmployeeLog
WHERE vr_EmployeeLog.DateTimeStart >= '20151012'
AND vr_EmployeeLog.DateTimeStart < '20151019' --<< "the next day"

Do not be tempted to use "between" for this, always use >= and <

the best practice with date and time ranges is to avoid BETWEEN and to always use the form:

WHERE col >= '20120101' AND col < '20120201' This form works with all types and all precisions, regardless of whether the time part is applicable.

Itzik Ben-Gan

also

Bad habits to kick : mis-handling date / range queries

Answer 2

I think you should try:

SELECT 
    DATEADD(wk,DATEDIFF(wk,0,DateTimeStart),0) period_start,
    DATEADD(day, 6, DATEADD(wk,DATEDIFF(wk,0,DateTimeStart),0)) period_end
FROM vr_EmployeeLog

--ADD 6 days into period_start