Use of ISNULL in SQl Server

Here is the solution to replace NULL with some value in Query itself.
Consider following table:

TESTING

No	Data
1	ASP.NET
2	PHP
3	null

Now Run this Query
SELECT ISNULL(data,'0') AS RESULT FROM TESTING

OUTPUT WILL BE:

No	Data
1	ASP.NET
2	PHP
3	0