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 _______ function adds values together for a group of rows.






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






3. A calculation with a null always yields...






4. __________________ inserts the current date and time.






5. _________ and __________ functions are opposites of each other and provide a value in a group of rows.






6. Returns rows if the condition is true for all the values in the list






7. Comparison operators can compare multiple _________________.






8. You use the _________ keyword to add columns or constraints to a table.






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






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






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






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






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






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






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






16. 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.






17. SELECT * FROM instructor ORDER BY phone






18. The TIMESTAMP WITH LOCAL TIME ZONE data type allows...






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






20. Explain why constraints are used when building tables.

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






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






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






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






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






26. 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.






27. The purpose of the HAVING clause is to eliminate___________.






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






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






30. _________________ relationships are always optional relationships.






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






32. The ____________ clause on a CREATE TABLE statement can specify how much space to allocate.






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






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






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






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






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






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






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






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






41. The ___________ operator tests whether a matching row cannot be found.






42. The _____________ clause determines how rows are grouped.






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






44. SELECT LIST of a subquery in an INSERT statement






45. The Nonequijoin can use the ________________ operator to construct joins that are not based on equality of values.






46. 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.






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






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






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






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