1. sql server 2005 is case sensitive or not......
2. do sql have normalization concept like oracle.........
1. Can be either, depending on your configuration. By default, I believe (read: not sure), is no, it's not case sensitive.
2. Am not into terms, but if you're talking about normalization on your db and tables, yes, SQL-Server, by design, is a relational database. But it still depends on your implementation. If you just create a table without implementing these features, then it's just serving as storage.
-- CK