How to return a default value when no rows are returned from the select statement

Question

I have a select statement that returns two columns, a date column, and a count(value) column. When the count(value) column doesn\'t have any records,

Answer 1

select convert(varchar(25), DateTime, 101) as recordDate,
       CASE WHEN count(value) =0 THEN 0 ELSE COUNT(value) END  recordCount
from History
where Value < 700
group by convert(varchar(25), DateTime, 101)