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. It is considered good form to put all SQL commands in...






2. When returning multiple rows - a subquery must contain the _____ - _____ - _____ - or ______ operator - otherwise Oracle will return an error






3. To place a line comment in your SQL statements - you first place a // at the beginning of the line.






4. List the reasons that a subquery could not be unnested.






5. What is the Oracle data dictionary called that contains a set of tables and views containing the data about the database?






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






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






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






9. The ____________ icon allows you to execute multiple statements and emulates SQL *Plus as much as possible.






10. You use the __________ keyword to change characteristics of a column.






11. The DUAL table can be used for...






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






14. List the different types of data dictionary views.






15. 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?






16. The COUNT function is useful for determining whether a table has...






17. What are the main components of a ROWID?






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






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






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






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






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






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






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






25. ____________ are useful for analyzing and exploring the relationships within your data






26. List 4 aggregate functions






27. To restart a sequence at a lower number - you can drop and ________ the sequence.






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






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






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






31. A transaction is a...






32. When using the data NUMBER(10 -4) there will be _______ digits following the decimal point.






33. The _______ function lets you perform if-then-else functionality with the SQL language.






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






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






36. The ______ depicts the M of a 1:M relationship.

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37. Explain how Oracle treats locks when a database is being updated and needs to be viewed by other users.






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






39. The _____________ clause determines how rows are grouped.






40. Write a statement that drops the index need_to_pass_i






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






42. An outer join includes the result rows returned by an __________ plus extra rows where no matches are found.






43. The ALTER SESSION statement can change the session's...






44. Dynamic views begin with a ___________.






45. Subqueries can return...






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






47. When is it not a good idea to use an index?






48. The same function can be used ______ in a SELECT statement.






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






50. Comparison operators can compare multiple _________________.







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