Expression for Labeling and Selecting Null Values

[ltc]

Hi,

I have a column name "CCaR User DD2875 is Valid" which has Yes, No, and Null values.  I'd like to label the null values as "Empty" and make the null values selectable.  What is the expression for this?

Thank you

[ltc]

wow!  thank you so much!  that worked

[vishsaggi]

No problem.