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






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






3. The NEXTVAL and CURRVAL pseudocolumns can be used in which of the following SQL constructs? Select all that apply.






4. FEEDBACK






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






6. The ______ operator compares a list of values for equivalency






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






8. 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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9. NUMBER functions can be...






10. The ____________ command makes changes permanent.






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






12. A transaction is a...






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






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






15. Queries that are found in parentheses are done first - just as in the order of operations when doing...






16. SELECT * FROM instructor ORDER BY phone






17. Comparison operators can compare multiple _________________.






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






19. 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.






20. List the different types of data dictionary views.






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






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






23. The focus of the logical data model is _____________






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






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






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






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






28. List 4 aggregate functions






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






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






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






32. Subqueries can return...






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






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






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






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






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






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






39. What does SQL stand for?






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






41. Explain why constraints are used when building tables.

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42. The _______ operator determines common rows.






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






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






45. _________________ relationships are always optional relationships.






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






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






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






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






50. The ROWID pseudocolumn is not an ________- but it acts like one.