This would do the trick:
SELECT
CASE
WHEN ISNULL(rate,100)=100 THEN 1
ELSE 0
END AS Rate
FROM {yourtable}
"I cant stress enough the importance of switching from a sequential files mindset to set-based thinking. After you make the switch, you can spend your time tuning and optimizing your queries instead of maintaining lengthy, poor-performing code."-- Itzik Ben-Gan 2001