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 DUAL table can be used for...






2. 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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3. You can pass parameters from the operating system when ___________ in SQl*Plus






4. The query retrieves more than 5 to 15 percent of the rows






5. To equijoin a table with another table involves matching the...






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






7. Another name for a data dictionary view is __________________ or _________________.






8. In a view you can give a column a different name than it has in the...






9. The COUNT function uses the __________ wildcard.






10. SELECT LIST of a subquery in an INSERT statement






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






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






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






14. The data type definitions NUMBER(10) and NUMBER(10 -0) are the...






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






16. Which operator is most commonly used?






17. Write a statement that drops the index need_to_pass_i






18. How many characters can be stored in the CHAR column/field?






19. What is the data type you can use if you need an unlimited number of textual characters?






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






21. The _______ operator determines common rows.






22. Information that is returned after you run your statement are found in the __________ tab in SQL Developer.






23. The _____________ clause determines how rows are grouped.






24. The time zone displacement value indicates the time difference from _______.






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






26. What is the syntax used to indicate that you are using the Oracle Outer Join operator?






27. A join across three tables can be expressed with the ________ join syntax.






28. It is always good practice to include the old values in the WHERE clause of UPDATE to ensure that another session or user _________________ in the meantime.






29. If a graphical representation of a table's box has __________ it means that the relationship is identifying.






30. SQL Developer's ____________________ option allows you to selectively export certain rows and columns.






31. Explain how Dynamic SQL is used and give an example of a Dynamic SQL statement.






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






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






34. Explain how the SPOOL command is used and what program it can be used in.






35. What is the maximum value for a column defined as NUMBER(4 -2)?






36. Checks whether any value in the list makes the condition true.






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






38. When using the following data: NUMBER(10 -4) - the lowest number you can possibly have is __________.






39. Self-joins are useful for performing comparisons and checking for ___________ in data.






40. 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.






41. When you want to run a script in either SQL*Plus or SQL Developer - you can use a ______ or the _________ command.






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






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






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






45. __________________ inserts the current date and time.






46. Which format mask displays December 31st - 1999?






47. What is the most common DATE format found in SQL?






48. UNION ALL does not sort - therefore it is less time consuming to use than the...






49. How many characters can you have using the VARCHAR data type?






50. SELECT * FROM instructor ORDER BY phone






Can you answer 50 questions in 15 minutes?



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