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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. All SQL statements contained within a script must end with a _______________ - even if they are done in SQL Developer.
999999.9999
Committed
Semicolon or forward slash
Columns

2. What does SQL stand for?
VALUES clause of an INSERT statement
Testing functions
Structured Query Language
A correct statement

3. When returning multiple rows - a subquery must contain the _____ - _____ - _____ - or ______ operator - otherwise Oracle will return an error
99.99
IN ANY ALL SOME
MINUS
Fractional seconds

4. When you want to run a script in either SQL*Plus or SQL Developer - you can use a ______ or the _________ command.
@ or START
Black
DICTIONARY
ANY

5. Comparison operators can compare multiple _________________.
Semicolon or forward slash
ON
Columns
DROP INDEX need_to_pass_i

6. SELECT * FROM instructor ORDER BY phone
A correct statement
Black
Correlated
2000

7. The COUNT function is useful for determining whether a table has...
Primary key/foreign key
Data
All
FALSE

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

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9. The TRUNC function on a date without a format model truncates the timestamp to...
Same
Results
12:00:00 A.M
FALSE

10. The DUAL table can be used for...
2000
+
Testing functions
Scale

11. The ________________ is a type of statement whereby you retrieve data that exists in one table - but not in another.
Scale
Retrieve
MINUS
COUNT(registration_date) - AVG (capacity) - MIN (capacity) - MAX (capacity)

12. Explain how you can optimize your queries with subqueries and the main advantage of doing so.
Details
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
Multiple rows
The static data dictionary stores details about database objects - such as tables - indexes - and views. Whenever a new object is added or an object is changed - data about the object is recorded in the data dictionary.

13. Write a statement that drops the index need_to_pass_i
All caps
DROP INDEX need_to_pass_i
VALUES
Crow's foot

14. How many characters can be stored in the CHAR column/field?
Columns
The way NULL values are treated
2000
VALUES clause of an INSERT statement

15. An outer join includes the result rows returned by an __________ plus extra rows where no matches are found.
4000
Optional
Equijoin
B-Tree Index

16. Write a solution that adds 20 minutes to a given date.
Leading-edge
BETWEEN
+
SELECT SYSDATE+1/96 - FROM dual

17. Write an SQL statement for SQL *Plus in which you want any unique menu items to be displayed from the restaurant table
BETWEEN
+
SELECT DISTINCT menu FROM restaurant
Lists all objects accessible for the chosen database connection. Also lists a helpful dependencies report for accessing change impact.

18. Returns rows if the condition is true for all the values in the list
+
All
Another null
User-defined reports

19. You can use the ________________ to subtract months from a given date.
ALL_OBJECTS
Location of the file
Logical unit of work
ADD_MONTHS function

20. The time zone displacement value indicates the time difference from _______.
UTC
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
Business problems
Parent table

21. A _________ subquery returns a single column with a single row
Rounded edges
B-Tree Index
Scalar
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

22. The RTRIM function is useful for eliminating ________ in a string.
Extra spaces
ON
IN ANY ALL SOME
FALSE

23. The ____________ keywords and the USING clause of the ANSI join syntax are mutually exclusive.
Same
Default is 14; when you use the default - you repeat the heading every 14 rows.
Three
NATURAL JOIN

24. In SQL Developer field names and table names are shown in the color _______.
DD-MON-YY
Black
12:00:00 A.M
4000

25. Explain how Oracle treats locks when a database is being updated and needs to be viewed by other users.
RENAME - COPY - DROP - TRUNCATE - LOCK - & COMMENT
A correct statement
Same
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

26. What is the first column of a composite index called?
Equijoin and correlated subquery
Leading-edge
Orphan
Non-matching rows

27. NUMBER functions can be...
Nested
Any
MINUS
Equijoin and identical column names

28. The ___________ operator tests whether a matching row cannot be found.
+
Command returns the number of records returned by a query.
RENAME just_two_more_weeks TO finally_i
X

29. To join four tables - you must have at least _____ join conditions.
Equijoin and correlated subquery
Three
DROP INDEX need_to_pass_i
Fractional seconds

30. Explain how Dynamic SQL is used and give an example of a Dynamic SQL statement.
Lists all objects accessible for the chosen database connection. Also lists a helpful dependencies report for accessing change impact.
Combine
Three
Dynamic SQL is used to be continuously updated by the background processes in the Oracle instance but never by the user.

31. When using the following data: NUMBER(10 -4) - the # 4 is called the __________.
Static or dynamic
12:00:00 A.M
Null
Scale

32. Explain the steps needed to run a script in SQL Developer
FALSE
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.
TO_CHAR function
Scalar

33. The same function can be used ______ in a SELECT statement.
Orphan
Twice
X
Any

34. The NEXTVAL and CURRVAL pseudocolumns can be used in which of the following SQL constructs? Select all that apply.
IN ANY ALL SOME
VALUES clause of an INSERT statement
All caps
NATURAL JOIN

35. The COUNT function uses the __________ wildcard.
Logical unit of work
4
Asterisk
Primary key/foreign key

36. When you have issued a DELETE command - you can still ________ those rows and restore the information.
DROP INDEX need_to_pass_i
When you want to run the same script repeatedly - but want to be able to change a variable you would use a substitution variable. During the execution of the script the user will be prompted to input the variable to use.
DICTIONARY
Retrieve

37. Write the syntax to rename index just_two_more_weeks_i to finally_i
Time zone
RENAME just_two_more_weeks TO finally_i
LENGTH
Non-matching rows

38. The ____________ command makes changes permanent.
Hide data
Primary key/foreign key
Structured Query Language
COMMIT

39. Users can only see changes made to a database once they have been...
Committed
ANSI
SYSDATE
Crow's foot

40. You use the __________ keyword to change characteristics of a column.
V$
Dynamic SQL is used to be continuously updated by the background processes in the Oracle instance but never by the user.
Rounded edges
MODIFY

41. What is Oracle's most popular index storage structure?
UNION operator
B-Tree Index
**** Select a row from the outer query - Determine the value of the correlated column - Execute the inner query for each record of the outer query. - Feed the results of the inner query to the outer query and evaluate it. It if satisfies the criteria
Static or dynamic

42. Queries that are found in parentheses are done first - just as in the order of operations when doing...
Static or dynamic
FALSE
Lists all objects accessible for the chosen database connection. Also lists a helpful dependencies report for accessing change impact.
Mathematical equations

43. The TIMESTAMP WITH LOCAL TIME ZONE data type allows...
User-defined reports
Any
+
Fractional seconds

44. To restart a sequence at a lower number - you can drop and ________ the sequence.
DICT_COLUMNS
COUNT(registration_date) - AVG (capacity) - MIN (capacity) - MAX (capacity)
Re-create
When the table is small (unless your business rules require you too)

45. 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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46. What is the command you would type into SQL*Plus if you needed to know the definition for each column of a table?
Command returns the number of records returned by a query.
DICT_COLUMNS
VALUES clause of an INSERT statement
Hide data

47. Instead of using the Oracle Outer Join Operator or the ANSI syntax - you can achieve the same result with two SQL statements: ____________ and a ____________
Same
ADD_MONTHS function
Equijoin and correlated subquery
Scale

48. The _______ function lets you perform if-then-else functionality with the SQL language.
Columns
Any
RIGHT LEFT JOIN
DECODE

49. 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.
Implicit conversion
RIGHT LEFT JOIN
Crow's foot
Month ddth - yyyy

50. The focus of the logical data model is _____________
Export Data
Business problems
The static data dictionary stores details about database objects - such as tables - indexes - and views. Whenever a new object is added or an object is changed - data about the object is recorded in the data dictionary.
Combine

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Oracle SQL

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