Oracle SQL, PL/SQL Interview Question List

These are some Oracle SQL, PL/SQL Interview Question List
1. How do you convert a date to a string?
2. What is an aggregate function?
3. What is the dual table?
4. What are cursors? Distinguish between implicit and explict cursors?
5. Explain how cursors are used by Oracle?
6. What is PL/SQL? Describe the block structure of PL/SQL?
7. What is a nested subquery?
8. What are the various types of queries ?
9. Which of the following is not a schema object : Index, table, public synonym, trigger and package ?
10. What is dynamic sql in oracle?
11. What is the difference between a package, procedure and function?
12. What is the difference between delete, drop and truncating a table?
13. How many triggers are supported in Oracle
14. Are you aware of FLASHBACK concept ? What is it?
15. Describe oracle’s logical and physical structure?
16. What is data dictionary ?
17. What is the use of control files ?
18. How would store XML data in table ? What data type would be used for the columns?
19. Difference between post and commit?
20. Difference between commit and rollback?
21. What are savepoints?
22. What is the Difference between a View and Synonym?
23. How would you fetch system date from oracle?
24. What is the difference between primary key, unique key, foreign key?
25. What is the difference between NO DATA FOUND and %NOTFOUND?
26. What is cursor for loop?
27. What are cursor attributes?
28. What will you use in Query : IN or EXISTS? Why?
29. Explain the difference between a data block, an extent and a segment.?
30. What's the difference between logical and physical I/O?
31. What is an anonymous block?
32. What is a PL/SQL collection?
33. How can you tell if an UPDATE updated no rows?
34. How can you tell if a SELECT returned no rows?