Question

I have a data result that I want to filter by two different dates.

The below is working except when completion_date is null. If it is null I want to use a different field called created_date.

string strSQL = string.Format(@"select * from my_table 

            where user_Id = {0}

            AND [completion_date] between {1} AND {2}

            order by completion_status  desc, [completion_date] asc"
            , userId, dateStart, dateEnd, visibilityIndicator);

Perhaps something like this:

string strSQL = string.Format(@"select * from my_table                                                   
where user_Id = {0}


CASE completion_date 
     WHEN is null THEN [completion_date] between {1} AND {2}
     ELSE [created_date] between {1} AND {2}

END 

AND                       
            order by completion_status  desc, [completion_date] asc"
            , userId, dateStart, dateEnd, visibilityIndicator);

What is the best way to check for that null value and then switch to created_date?

Answer 1

where isnull(completetion_date,created_date) between {1} and {2}

should work