SELECT [stuff]
FROM [thing]
WHERE
(demo_code = 'DE1' AND demo_vchar_data = 'U')
OR
(demo_code = 'RAP' AND demo_vchar_data = 'YES')
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden