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Oracle SQL

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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 DUAL table can be used for...
Testing functions
Results
Null
99.99

2. 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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3. You can pass parameters from the operating system when ___________ in SQl*Plus
When you issue a INSERT - UPDATE - DELETE - or MERGE statement - Oracle automatically locks the modified rows. The lock prevents other sessions from making changes to these rows. The lock is released when the session initiating change commits or roll
Equijoin
Running a script file
Self-joins

4. The query retrieves more than 5 to 15 percent of the rows
The indexed column is part of an expression. In this case - consider creating a function-based index instead
Groups
Data
VALUES

5. To equijoin a table with another table involves matching the...
Common column value
Logical unit of work
When the table is small (unless your business rules require you too)
NATURAL JOIN

6. The ____________ keywords and the USING clause of the ANSI join syntax are mutually exclusive.
Twice
NATURAL JOIN
Groups
The main components of a ROWID are the data object number - the number of the data block - the numbers of rows within the data block - and the data file number.

7. Another name for a data dictionary view is __________________ or _________________.
Surrogate key
FALSE
RIGHT LEFT JOIN
Static or dynamic

8. In a view you can give a column a different name than it has in the...
Non-matching rows
Scale
When the table is small (unless your business rules require you too)
Parent table

9. The COUNT function uses the __________ wildcard.
ANY
Asterisk
ALL_OBJECTS
VALUES clause of an INSERT statement

10. SELECT LIST of a subquery in an INSERT statement
SET clause of an UPDATE statement
Constraints are used to enforce the business rules of a system. For instance - 'The salary of an employee may not be a negative number' may be enforced with a check constraint on the salary column. Constraints also ensure integrity and data consisten
MINUS
Re-create

11. What is the tab in SQL Developer where data dictionary view information can be found?
RUN SCRIPT
Null
Details
+

12. Explain how you can optimize your queries with subqueries and the main advantage of doing so.
Subqueries allow you to nest multiple queries into each other. This gives you the ability to use one statement to break down a problem into individual components. Without nesting queries - you would be required to have multiple queries which could be
Crow's foot
Constraints are used to enforce the business rules of a system. For instance - 'The salary of an employee may not be a negative number' may be enforced with a check constraint on the salary column. Constraints also ensure integrity and data consisten
SYSDATE

13. When you have issued a DELETE command - you can still ________ those rows and restore the information.
4
SYSDATE
Subqueries allow you to nest multiple queries into each other. This gives you the ability to use one statement to break down a problem into individual components. Without nesting queries - you would be required to have multiple queries which could be
Retrieve

14. The data type definitions NUMBER(10) and NUMBER(10 -0) are the...
UNION
Location of the file
Same
SELECT SYSDATE+1/96 - FROM dual

15. Explain the steps needed to run a script in SQL Developer
Load the file into the SQL Statement Box - by opening the location the file is stored and inserting it into the statement Box. Next you can press the F5 key.
DESC dict;
When the table is small (unless your business rules require you too)
FALSE

16. Which operator is most commonly used?
Has not changed the name
Command determines the total number of characters SQL *Plus displays in on line before beginning a new line.
UNION
The indexed column is part of an expression. In this case - consider creating a function-based index instead

17. Write a statement that drops the index need_to_pass_i
Data
DROP INDEX need_to_pass_i
Semicolon or forward slash
FALSE

18. How many characters can be stored in the CHAR column/field?
DESC dict;
UNION operator
2000
DICT_COLUMNS

19. What is the data type you can use if you need an unlimited number of textual characters?
Asterisk
CLOB
@ or START
The way NULL values are treated

20. When using the following data: NUMBER(10 -4) - the # 4 is called the __________.
4
Scale
Mathematical equations
12:00:00 A.M

21. The _______ operator determines common rows.
ON
LENGTH
INTERSECT
ANY

22. Information that is returned after you run your statement are found in the __________ tab in SQL Developer.
Results
Actual column
FALSE
DD-MON-YY

23. The _____________ clause determines how rows are grouped.
MODIFY
GROUP BY
IN ANY ALL SOME
Non-matching rows

24. The time zone displacement value indicates the time difference from _______.
Constraints are used to enforce the business rules of a system. For instance - 'The salary of an employee may not be a negative number' may be enforced with a check constraint on the salary column. Constraints also ensure integrity and data consisten
To achieve good performance for data retrieval and data manipulation statements Oracle uses indexes. In the same way you would use an index in the back of a book to quickly find information - Oracle uses indexes to speed up data retrieval. If the app
UTC
SET clause of an UPDATE statement

25. Joins involving multiple columns must always follow the ____________ relationship path.
Structured Query Language
Scalar
Primary key/foreign key
Run scripts

26. What is the syntax used to indicate that you are using the Oracle Outer Join operator?
+
FALSE
Parent table
UNION

27. A join across three tables can be expressed with the ________ join syntax.
ANSI
Data
DICTIONARY
Hide data

28. 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.
When the table is small (unless your business rules require you too)
4000
Has not changed the name
Orphan

29. If a graphical representation of a table's box has __________ it means that the relationship is identifying.
Structured Query Language
Nested
Rounded edges
RENAME - COPY - DROP - TRUNCATE - LOCK - & COMMENT

30. SQL Developer's ____________________ option allows you to selectively export certain rows and columns.
Export Data
A correct statement
Self-joins
Rounded edges

31. Explain how Dynamic SQL is used and give an example of a Dynamic SQL statement.
Control - Revoke - Define - TRUNCATE Manipulate - MERGE
Dynamic SQL is used to be continuously updated by the background processes in the Oracle instance but never by the user.
Command determines the total number of characters SQL *Plus displays in on line before beginning a new line.
Load the file into the SQL Statement Box - by opening the location the file is stored and inserting it into the statement Box. Next you can press the F5 key.

32. What do views do that makes them so useful for security?
Hide data
Equijoin
SYSDATE
Surrogate

33. SQL*Plus is used more than SQL Developer when you need to...
Month ddth - yyyy
Run scripts
Precision
Committed

34. Explain how the SPOOL command is used and what program it can be used in.
2000
ANSI
The SPOOL command - together with a file name - spools any subsequently issued SQL Plus or SQL command to a file. Just as with other file names - you can add a path to store the file in a directory other than your SQL Plus default directory. SQL Deve
Black

35. What is the maximum value for a column defined as NUMBER(4 -2)?
99.99
4
Run scripts
RENAME just_two_more_weeks TO finally_i

36. Checks whether any value in the list makes the condition true.
Black
+
Any
12:00:00 A.M

37. You can use the ________________ to subtract months from a given date.
Command returns the number of records returned by a query.
SELECT DISTINCT menu FROM restaurant
ADD_MONTHS function
The way NULL values are treated

38. When using the following data: NUMBER(10 -4) - the lowest number you can possibly have is __________.
ON
999999.9999
Dynamic SQL is used to be continuously updated by the background processes in the Oracle instance but never by the user.
RENAME - COPY - DROP - TRUNCATE - LOCK - & COMMENT

39. Self-joins are useful for performing comparisons and checking for ___________ in data.
Any
Inconsistencies
4000
UNION

40. 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.
B-Tree Index
TO_CHAR function
Orable's flashback query feature allows you to look at values of a query at a specific time in the past - such as before specfic DML statements occured. This can be usefull in case a suer accidentally performs an unintended but committed DML change.
VALUES

41. When you want to run a script in either SQL*Plus or SQL Developer - you can use a ______ or the _________ command.
SYSDATE
GROUP BY
@ or START
Export Data

42. You can simplify the writing of SQL statements by writing SQL _________ that generate and execute other SQL statements.
12:00:00 A.M
When the table is small (unless your business rules require you too)
X
Script

43. What is Oracle's most popular index storage structure?
B-Tree Index
LIKE
Logical unit of work
Script

44. A _____ is a query definition stored in the database that looks just like a table - but does not have any physical rows
Asterisk
2000
Combine
X

45. __________________ inserts the current date and time.
4
SYSDATE
Logical unit of work
X

46. Which format mask displays December 31st - 1999?
VALUES clause of an INSERT statement
Has not changed the name
X
Month ddth - yyyy

47. What is the most common DATE format found in SQL?
Dynamic SQL is used to be continuously updated by the background processes in the Oracle instance but never by the user.
BETWEEN
Precision
DD-MON-YY

48. UNION ALL does not sort - therefore it is less time consuming to use than the...
Equijoin and correlated subquery
UNION operator
Testing functions
Nested

49. How many characters can you have using the VARCHAR data type?
MODIFY
The main components of a ROWID are the data object number - the number of the data block - the numbers of rows within the data block - and the data file number.
Any
4000

50. SELECT * FROM instructor ORDER BY phone
BETWEEN
Primary key/foreign key
A correct statement
Logical unit of work

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Oracle SQL

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