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






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






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






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






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






6. Subqueries can return...






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






8. List the different types of data dictionary views.






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






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






11. Explain the differences in how an ANSI Full Outer Join and a Full Outer Join using the UNION Operator work






12. Which operator is most commonly used?






13. Explain why constraints are used when building tables.

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14. The ________ operator cannot compare against a list of values.






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






16. Write a statement for SQL*Plus that shows the dictionary.






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






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






19. What are the main components of a ROWID?






20. The _____________ clause determines how rows are grouped.






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






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






23. A transaction is a...






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






25. Write an SQL statement for SQL *Plus in which you want any unique menu items to be displayed from the restaurant table






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






27. Write the syntax to rename index just_two_more_weeks_i to finally_i






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






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






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






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






32. The COUNT function uses the __________ wildcard.






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






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






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






36. Comparison operators can compare multiple _________________.






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






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






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






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






41. Which one of the following string functions tells you how many characters are in a string?






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






43. 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.






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






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






46. The ____________ command makes changes permanent.






47. When you run a script in SQL*Plus you must give the...






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






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






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