Test your basic knowledge |

Oracle SQL

Subjects : oracle, it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The ___________ operator tests whether a matching row cannot be found.






2. Explicit data type conversion is preferable to Oracle's...






3. List 6 Table-Related Menu Choices






4. Converting a text literal to DATE format requires the use of the...






5. The term ____________ ___________ is used to express a join that satisfies the join condition.






6. When you have issued a DELETE command - you can still ________ those rows and restore the information.






7. A _________ subquery returns a single column with a single row






8. The ________________ is a type of statement whereby you retrieve data that exists in one table - but not in another.






9. Match each of the SQL commands on the left with a verb from the list.






10. Explain the steps needed to run a script in SQL Developer






11. You can __________ DISTINCT and a GROUP BY clause in the same SELECT statement.






12. You can use the ________________ to subtract months from a given date.






13. What is the name of the view where you can find the collection of static and data dictionary tables and views - along with their descriptions?






14. When column names on the tables are different - you use the ______ condition.






15. When using the following data: NUMBER(10 -4) - the # 10 is called the __________.






16. The key that most database designers prefer and is chosen by the system is the _____________ key.






17. Explain what is found in the All Objects report folder in SQL Developer






18. Joins involving multiple columns must always follow the ____________ relationship path.






19. The ____________ keywords and the USING clause of the ANSI join syntax are mutually exclusive.






20. What is the tab in SQL Developer where data dictionary view information can be found?






21. Oracle uses the outer join operator to indicate that nulls are shown for...






22. When disabling a unique or primary key - you can keep the index if you specify the __________________ clause in the ALTER TABLE statement.






23. A _____ is a query definition stored in the database that looks just like a table - but does not have any physical rows






24. Explain Flashback queries and how they are used. Give an example of a FLASHBACK_TRANSACTION query and explain what it does row by row.

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25. SELECT * FROM instructor ORDER BY phone






26. All SQL statements contained within a script must end with a _______________ - even if they are done in SQL Developer.






27. The RTRIM function is useful for eliminating ________ in a string.






28. Which operator is most commonly used?






29. SQL*Plus is used more than SQL Developer when you need to...






30. FEEDBACK






31. The COUNT function uses the __________ wildcard.






32. SQL Developer provides an extensive list of useful reports and offers the capability to create your own...






33. Explain what a static data dictionary view is and how it is used






34. What is Oracle's most popular index storage structure?






35. __________________ inserts the current date and time.






36. The focus of the logical data model is _____________






37. To join four tables - you must have at least _____ join conditions.






38. What do views do that makes them so useful for security?






39. What are the main components of a ROWID?






40. Write a statement for SQL*Plus that shows the dictionary.






41. _________ rows are not allowed in the relational model.






42. What is the name of the key automatically generated from a sequence?






43. What is the keyboard shortcut for the ROLLBACK command?






44. Write a statement that drops the index need_to_pass_i






45. The ____________ command makes changes permanent.






46. You can simplify the writing of SQL statements by writing SQL _________ that generate and execute other SQL statements.






47. The using clause of the ANSI join syntax always assumes an...






48. Instead of using the Oracle Outer Join Operator or the ANSI syntax - you can achieve the same result with two SQL statements: ____________ and a ____________






49. When you INSERT new information into a table - it is followed with a _______ keyword that contains the information that is going to be added to the table.






50. Explain how you can optimize your queries with subqueries and the main advantage of doing so.