Automatic Daily report - how to adjust dates

Question

Hi,
I am seeking help with date syntax in SQL.
I have created a query that uses "where convert(date, a.visistdatetime) = convert(date , getdate ()-1) in the where statement to pull the previous day's visits. The plan is to automate this query into a daily report in a SQL
server environment.
The problem is, my "where" clause does not account for weekends when business is closed. In the case of Monday's, I am seeking query "date" syntax that will pull visits from the previous work day (which would be Friday). I'd
like the same to happen whenever a Holiday occurs.
Any ideas?

Answer 1

In addition to Patrick's, if you wouldn't like the where clause looks too complex, you may reference pseudo-code below.
;WITH cte
AS --get all consecutive weekdays
(SELECT *
FROM calendartable
WHERE isholiday = 0
AND weekday NOT IN( 1, 7 )),
cte2
AS -- join cte to get all weekdays in your table
(SELECT y.*,
Dense_rank()
OVER(ORDER BY y.[date]) AS DR
FROM yourtable y
JOIN cte c
ON y.[date] = c.[date])
SELECT * --get previous workday's data
FROM cte2
WHERE dr = (SELECT dr - 1
FROM cte2
WHERE [date] = Getdate())
If you have any question, feel free to let me know.
Eric Zhang
TechNet Community Support