1.What is normalization?
2.How to convert Listtag into normal table view?
3.I have 100 lines of procedure and 23 line not executed but I want remaining line will be executed what You do? 
4.Where did you use partition table in your application?
5.What is collection which collection you used recently in your application?
6.What is SQL loader?
7.delete duplicate using join?
8.sub query type and recently used sub query and how did you use?
9.what is correlated sub query did you use so for?