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. List 4 aggregate functions






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

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3. When writing an ANSI outer join - the keywords _________ OUTER and _________ OUTER are added to the __________ keyword to indicate the rows from which table to use.






4. FEEDBACK






5. The _______ operator determines common rows.






6. List the steps performed by a correlated subquery.






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






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






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






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






11. The COUNT function uses the __________ wildcard.






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






13. To revert back to a state that happened before you ran your change statement - you issue a ____________ command.






14. The ____________ command makes changes permanent.






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






16. The TRUNC function on a date without a format model truncates the timestamp to...






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






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






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






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






21. Comparison operators can compare multiple _________________.






22. A transaction is a...






23. The __________ operator is inclusive of the two values specified.






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






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






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






27. Which operator is most commonly used?






28. Explain how Substitution Variables are used when writing scripts.






29. When writing the syntax for finding information on three or more tables - the parenthesis around the ON clause is...






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






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






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






33. What does the following function return? SELECT LENGTH(NULL) - FROM dual






34. ___________ subqueries allow you to reference columns from the outer query and execute the inner query repeatedly






35. Dynamic views begin with a ___________.






36. What are the main components of a ROWID?






37. The _______ function adds values together for a group of rows.






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






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






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






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






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






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






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






45. Write a statement that drops the index need_to_pass_i






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






47. Explain in detail the impact of INDEXES and how they are used by Oracle.






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






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






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