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

To generate rows for missing dates you can join your data to a date dimension table

It would look something like this:

select convert(varchar(25), ddt.DateField, 101) as recordDate,
       count(t.Value) as recordCount
from History h
right join dbo.DateDimensionTable ddt
    on ddt.DateField = convert(varchar(25), h.DateTime, 101)
where h.Value < 700
group by convert(varchar(25), h.DateTime, 101)

If your table uses the DateTime column to store dates only (meaning the time is always midnight), then you can replace this

right join dbo.DateDimensionTable ddt
    on ddt.DateField = convert(varchar(25), h.DateTime, 101)

with this

right join dbo.DateDimensionTable ddt
    on ddt.DateField = h.DateTime