Sql Server 2008 Exclude Company Holiday from DateDiff

问题

I have three tables, One of which is a master calendar that houses an indicator for company Holidays. I would like to exlude Holiday from my DateDiff calculation. Below is what I have...

alert date 12/23/16 complete date 12/28/16 company Holiday 12/26/16 Need to exlude from DateDIff calculation

--My calculation shows 3 business days it should exclude 12/26/16 = 2 business days

 DATEDIFF(DD,A.ALERTS_CREATE_DT,S.CreatedDate) 
           -(DATEDIFF(WK,A.ALERTS_CREATE_DT,S.CreatedDate) * 2)  --HOW MANY WEEKEND DAYS PASSED BY
           -(CASE WHEN DATENAME(DW,A.ALERTS_CREATE_DT) = 'Sunday' THEN 1 ELSE 0 END) 
           -(CASE WHEN DATENAME(DW,S.CreatedDate) = 'Saturday' THEN 1 ELSE 0 END) 
           -(CASE WHEN CAL.GRH_HOLIDAY_IND = 'Y' THEN 1 ELSE 0 END) 
           -(  SELECT COUNT(CAL.GRH_HOLIDAY_IND)
               FROM  A
               FULL OUTER JOIN S ON A.ID= S.ID
               INNER JOIN  CAL ON  A.ALERTCREATEDT_MMDDYYYY = CAL.CALENDAR_DATE
               WHERE 1=1
               AND Cal.GRH_HOLIDAY_IND = 'Y' 
               AND CAL.CALENDAR_DATE  between CAST(A.CREATE_DT AS DATE) AND CAST(S.CreatedDate AS DATE) ) AS BusinessDays

Trying to remove the Holidays is where I'm struggling, see below.

-(  SELECT COUNT(CAL.GRH_HOLIDAY_IND)
               FROM  A
               FULL OUTER JOIN S ON A.ID= S.ID
               INNER JOIN  CAL ON  A.ALERTCREATEDT_MMDDYYYY = CAL.CALENDAR_DATE
               WHERE 1=1
               AND Cal.GRH_HOLIDAY_IND = 'Y' 
               AND CAL.CALENDAR_DATE  between CAST(A.CREATE_DT AS DATE) AND CAST(S.CreatedDate AS DATE

回答1:

After 2 case statements you can add below statement to subtract no of days from holiday Calendar table.

- (select ISNULL(count(1),0) from Cal where Cal.Holiday between ALERTS_CREATE_DT AND CreatedDate )

来源：https://stackoverflow.com/questions/42721702/sql-server-2008-exclude-company-holiday-from-datediff

标签

sql-server-2008

datediff