section 9

Test: Section 9 Quiz Review your answers, feedback, and question scores below. A n asterisk (*) indicates a correct co rrect answer.

Section 9 Quiz (Answer all questions in this section)

1.

You try to create a function named MYFUNC. The function does not compile

correctly because there are errors in your code. Which Dictionary view can you query to see the errors? Mark for Review (1) Points

USER_SOURCE

USER_COMPILES

USER_ERRORS (*)

USER_DEPENDENCIES

USER_OBJECTS

Correct

Correct

2.

You have created a function named NEWFUNC. You now change some of the

function code, and try to recreate the function by executing: CREATE OR REPLACE FUNCTION newfunc .... ; What happens?

Mark for Review (1) Points

A second function named NEWFUNC_2 is created.

The command fails because the function f unction already exists.

The function is dropped but not recreated.

The function is automatically dropped and then recreated. (*)

The command fails because you should execute: CREATE AND REPLACE ....;

Correct

Correct

2.





The command fails because the function f unction already exists.




Correct

Correct

3.

To create a function successfully, the following steps should be performed.

A Re-execute the code until it compiles correctly correctly B Write the code containing the CREATE or REPLACE FUNCTION FUNCTION followed by the function code C Test the function from a SQL statement or an anonymous anonymous block D If the function fails to compile, correct the errors E Load the code into Application Express F Execute the code in Application Application Express Express

What is the correct order to perform these steps?


A,B,E,F,D,C

B,C,E,F,D,A

D,B,E,F,A,C

B,E,F,D,A,C (*)

Correct

Correct

4.

Which of the following is a legal location for a function call in a SQL

statement? (Choose 3) Mark for Review (1) Points

(Choose all correct answers)

VALUES clause of an INSERT statement (*)

CREATE TABLE statement

WHERE clause in a DELETE statement (*)

The ORDER BY and GROUP BY clauses of a query (*)

Correct

Correct

5.

You want to create a function which can be used in a SQL statement. Which

one of the following can be coded within your function? Mark for Review (1) Points

COMMIT;

An OUT parameter

RETURN BOOLEAN

One or more IN parameters (*)

Correct

Correct

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Test: Section 9 Quiz

Summary

Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer.


6.

Why will the following statement fail?

SELECT employee_id, tax(p_value => salary) FROM employees;


The data type for the tax variable does not match the data type for salary.

Name notation is not allowed. (*)

The statement will execute and not fail.

User-defined functions are not allowed in the SELECT clause.

Incorrect

Incorrect. Refer to Section 9 Lesson 2.

7. Rights"?

How do you specify that you want a procedure MYPROCA to use "Definer's

Mark for Review

(1) Points

CREATE OR REPLACE PROCEDURE myproca AUTHID OWNER IS...

Definer's Rights are the default, therefore no extra code or commands are needed. (*)

ALTER PROCEDURE myproca TO DEFINER;

GRANT DEFINER TO myprocA;

CREATE OR REPLACE PROCEDURE myproca AUTHID CURRENT_USER IS...

Correct

Correct

8.

What will happen when the following procedure is executed?

PROCEDURE log_usage (p_card_id NUMBER, p_loc NUMBER) IS PRAGMA AUTONOMOUS_TRANSACTION BEGIN INSERT INTO log_table (card_id, location, tran_date) VALUES (p_card_id, p_loc, SYSDATE); COMMIT; END log_usage; Mark for Review (1) Points

The subprogram will fail because it is missing AUTHID CURRENT_USER before IS.

The compilation will fail because a semicolon after AUTONOMOUS_TRANSACTION is required. (*)

The subprogram will fail because the PRAGMA statement must be before IS.

The program will compile successfully.

Correct

Correct

9.

What is one of the main purposes of the Data Dictionary?

Mark for

Review (1) Points

To provide a structured list of all objects in the database (*)

To provide a list of all objects in your schema, but not in other users' schemas

To ensure correct spelling of the values in VARCHAR2 table columns

To translate data from one language to another

To prevent users from accidentally dropping tables

Incorrect


10. true?

Which of the following statements about the "super-view" DICTIONARY is

Mark for Review

(1) Points

It can be thought of as a "catalog of the master catalog".

None of these.

It lists all the dictionary views.

All of these. (*)

We can use it like a Web search engine to remind ourselves of the names of dictionary views.

Incorrect

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11.

Which of the following will tell you how many functions you own?


SELECT FUNCTIONS FROM USER_OBJECTS;

SELECT COUNT(*) FROM USER_OBJECTS;

SELECT COUNT(*) FROM USER_PROCEDURES;

SELECT COUNT(*) FROM USER_FUNCTIONS;

SELECT COUNT(*) FROM USER_OBJECTS WHERE OB JECT_TYPE='FUNCTION'; (*)

Incorrect


12.

When a database object is first created, only its owner (creator) and the

Database Administrator are privileged to use it. True or False?

Mark for Review

(1) Points

True (*)

False

Correct

Correct

13.

JOE's schema contains a COUNTRIES table. The following commands are

executed by JOE and TOM: (JOE): GRANT SELECT ON countries TO tom WITH GRANT OPTION; (TOM): GRANT SELECT on joe.countries TO dick WITH GRANT OPTION; Now, JOE executes: REVOKE SELECT ON countries FROM tom; What happens to the grant to DICK?


DICK also loses his SELECT privilege. (*)

The REVOKE statement fails because only the Database Administrator (not JOE) can revoke privileges.

Nothing. DICK's privilege is preserved even though TOM lost his privilege.

The REVOKE statement fails because JOE must remove the SELECT privilege from both users at the same time.

Incorrect


14.

Which view would you query to see the detailed code of a procedure?


user_dependencies

user_procedures

user_errors

user_objects

user_source (*)

Incorrect


15.

Procedure ins_emp accepts an employee_id as an IN parameter and

attempts to insert a row with that employee_id into the EMPLOYEES table. Ins_emp does not contain an exception section. A second procedure is created as follows: CREATE OR REPLACE PROCEDURE call_ins_emp IS BEGIN ins_emp(99); -- this employee does not exist ins_emp(100); -- this employee already exists ins_emp(999); -- this employee does not exist EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('An exception occurred'); END;

When call_ins_emp is executed, (assuming Auto Commit is turned on), which rows will be inserted into the EMPLOYEES table?


999 only

99 and 999

99 only (*)

All three rows will be inserted

No rows will be inserted

Incorrect

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Test: Section 9 Quiz Review your answers, feedback, and question scores below. A n asterisk (*) indicates a correct answer.


1.

User DIANE owns a DEPARTMENTS table. User JOEL needs to update the

location_id column of Diane's table, but no other columns. Which SQL statement should Diane execute to allow this?

Mark for Review

(1) Points

GRANT UPDATE ON departments TO joel;

GRANT UPDATE(location_id) ON departments TO joel; (*)

GRANT UPDATE ON location_id OF departments TO joel;

GRANT UPDATE ON departments(location_id) TO joel;

GRANT UPDATE ON departments.location_id TO joel;

Incorrect


2.

You granted user JOE the privilege to query the EMPLOYEES table in your

schema. Now, you want to remove this privilege from JOE. Which command would you use? Mark for Review (1) Points

UNGRANT SELECT ON employees TO joe;

GRANT UNSELECT ON employees TO joe;

DENY SELECT ON employees TO joe;

REVOKE SELECT ON employees FROM joe; (*)

ROLLBACK;

Incorrect


3.

Function GET_JOB accepts an employee id as input and returns that

employee's job id. Which of the following calls to the function will NOT work?

Mark for Review

(1) Points

DBMS_OUTPUT.PUT_LINE(get_job(100));

IF get_job(100) = 'IT_PROG' THEN ...

v_job_id := get_job(100);

get_job(100,v_job_id); (*)

Incorrect


4. anonymous block. (1) Points

True

To create a function successfully,the first step is to test the code in an Mark for Review

False (*)

Incorrect


5.

Based on the following function definition:

Create function annual_comp (sal employees.salary%type, comm_pct IN employees.commission%type) ...

Which one of the following is an incorrect call for annual_comp?


Execute dbms_output.put_line(annual_comp (1000,.2));

Select employee_id, annual_comp(salary) from employees; (*)

Declare Ann_comp number (6,2); Begin ... Ann_comp := annual_comp(1000,.2); ... End;

Select employee_id, annual_comp(salary, commission_pct) from employees;

Incorrect

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6.

Which of the following is the correct syntax to create a procedure using

Invoker's Rights?

Mark for Review

(1) Points

CREATE PROCEDURE myproc AUTHID CURRENT_USER IS BEGIN ... (*)

CREATE PROCEDURE myproc IS BEGIN AUTHID CURRENT_USER ...

CREATE PROCEDURE myproc IS AUTHID CURRENT_USER BEGIN ...

CREATE PROCEDURE AUTHID CURRENT_USER myproc IS BEGIN ...

Correct

Correct

7.

Procedure GET_EMPS includes a SELECT…FROM EMPLOYEES. The procedure

was created using Invoker's Rights. Which of the following statements are true? (Choose three.) Mark for Review (1) Points


The user who executes the procedure needs EXECUTE privilege o n the procedure. (*)

The creator of the procedure needs SELECT privilege on EMPLOYEES. (*)

The user who executes the procedure does not need any privileges.

The user who executes the procedure needs SELECT privilege on EMPLOYEES. (*)

Incorrect


8.

User MARY executes this SQL statement:

SELECT COUNT(*) FROM USER_VIEWS;

A value of 15 is returned. Which of the following statements is true?


Mary has created views on 15 of her tables.

Other users have granted Mary SELECT privilege on 15 of their views.

There are 15 views in the database.

There are 15 views in Mary's schema. (*)

Incorrect


9.

A user executes the following statement:

CREATE INDEX fn_index ON employees(first_name);

What output will the following statement now display:

SELECT index_name FROM user_indexes WHERE index_name LIKE 'fn%'; Mark for Review (1) Points

No output will be displayed (*)

fn_index FN_INDEX

FN_INDEX

fn_index

Correct

Correct

10.

User JOHN wants to see the names of all the tables in his schema. He does

NOT want to see the names of any tables in other users' schemas. Which Dictionary view should he query? Mark for Review

(1) Points

DICTIONARY

ALL_TABLES

DBA_TABLES

JOHN_TABLES

USER_TABLES (*)

Incorrect

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11.

You want to remove the procedure NO_NEED from your schema. You

execute: DROP PROCEDURE no_need; Which Data Dictionary views are updated automatically?


None of these

USER_SOURCE

USER_OBJECTS

All of the above (*)

USER_PROCEDURES

Incorrect


12.


attempts to insert a row with that employee_id into the EMPLOYEES table. Ins_emp does not contain an exception section. A second procedure is created as follows: CREATE OR REPLACE PROCEDURE call_ins_emp IS BEGIN ins_emp(99); -- this employee does not exist ins_emp(100); -- this employee already exists ins_emp(999); -- this employee does not exist EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('An exception occurred'); END;



99 only (*)



99 and 999

999 only

Incorrect


13.

Which of the following is a legal location for a function call in a SQL

statement? (Choose 3) Mark for Review (1) Points


CREATE TABLE statement

WHERE clause in a DELETE statement (*)

VALUES clause of an INSERT statement (*)

The ORDER BY and GROUP BY clauses of a query (*)

Incorrect


14.

Function DOUBLE_SAL has been created as follows: CREATE OR REPLACE

FUNCTION double_sal (p_salary IN employees.salary%TYPE) RETURN NUMBER IS BEGIN RETURN(p_salary * 2); END; Which of the following calls to DOUBLE_SAL will NOT work? Mark for Review

(1) Points

None, they will all work (*)

SELECT last_name, double_sal(salary) FROM employees;

SELECT * FROM employees ORDER BY double_sal(salary) DESC;

SELECT * FROM employees WHERE double_sal(salary) > 20000;

UPDATE employees SET salary = double_sal(salary);

Correct

Correct

15.

Which of the following is a benefit of user-defined functions? (Choose 3)



They can do the same job as built-in system functions such as UPPER and ROUND.

They can often be used inside SQL statements. (*)

They can add business rules to the database and can be reused many times. ( *)

They can be used in a WHERE clause to filter data and thereby increase efficiency. (*)

Incorrect

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1.

You have forgotten the name of the Dictionary view USER_TABLES. Which of

the following statements is the best and quickest way to remind yourself? (1) Points

SELECT * FROM dictionary WHERE table_name = 'USER%';

Read the online Oracle documentation at http://technet.oracle.com.

Phone the database administrator.

Mark for Review

SELECT * FROM dict WHERE table_name LIKE 'USER%TAB%'; (*)

SELECT * FROM dictionary WHERE table_name = 'USER_TABLES';

Incorrect


2.

Which of the following is NOT a benefit of the Data Dictionary? Mark for

Review (1) Points

It allows the PL/SQL compiler to check for object existence; for example, when creating a procedure which references a table, the PL/SQL compiler can check that the table exists.

It allows us to remind ourselves of the names of our tables, in case we have fogotten them.

It allows us to check which system privileges have been granted to us.

It will speed up the execution of SELECT statements in which the WHERE clause column is not indexed. (*)

Incorrect


3.

You want to display the names of all tables in your schema, but you have

forgotten which Dictionary view to query. Which of the following will remind you of the name of the correct Dictionary view?

Mark for Review

(1) Points

SELECT * FROM USER_OBJECTS WHERE table_name LIKE '%TABLE%';

HELP DICTIONARY

SELECT * FROM DICTIONARY WHERE table_name LIKE 'USER%TAB%'; (*)

SELECT * FROM DICTIONARY WHERE table_name LIKE 'user%table%';

SELECT * FROM DICTIONARY WHERE table_name LIKE 'DBA%TABLE%';

Incorrect


4.


attempts to insert a row with that employee_id into the EMPLOYEES table. Ins_emp does not contain an exception section. A second procedure is created as follows: CREATE OR REPLACE PROCEDURE call_ins_emp IS BEGIN ins_emp(99); -- this employee does not exist ins_emp(100); -- this employee already exists ins_emp(999); -- this employee does not exist EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('An exception occurred');

END;



99 and 999

99 only (*)

999 only



Incorrect


5.

The following code shows the dependencies between three procedures:

CREATE PROCEDURE parent IS BEGIN child1; child2; END parent; You now try to execute:

DROP PROCEDURE child2; What happens?


CHILD2 is dropped successfully. PARENT and CHILD1 are both marked INVALID.

The database automatically drops PARENT as well.

CHILD2 is dropped successfully. PARENT is marked INVALID, but CHILD1 is still valid. (*)

The database automatically drops CHILD1 as well.

You cannot drop CHILD2 because PARENT is dependent on it.

Incorrect

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6.

User SALLY's schema contains a NEWEMP table. Sally uses Invoker's rights to

create procedure GET_NEWEMP which includes the line: SELECT ... FROM NEWEMP ... ;

Sally also grants EXECUTE privilege on the procedure to CURLY, but no other privileges. What will happen when Curly executes the procedure?


The procedure will fail because Curly does not have the EXECUTE ANY PROCEDURE system privilege.

The procedure will execute successfully.

The procedure will fail because Curly does not have SELECT privilege on NEWEMP.

The procedure will fail because there is no NEWEMP table in Curly's schema. (*)

Incorrect


7.

How do you specify that you want a procedure MYPROCA to use Invoker's

Rights? Mark for Review (1) Points

GRANT INVOKER TO myprocA;

Invoker's Rights are the default, therefore no extra code is needed.

CREATE OR REPLACE PROCEDURE myproca AUTHID CURRENT_USER IS... (*)

CREATE OR REPLACE PROCEDURE myproca AUTHID OWNER IS...

ALTER PROCEDURE myproca TO INVOKER;

Incorrect


8.

Which of the following is found in a function and not a procedure?


Return statement in the header (*)

IN parameters

Local variables in the IS/AS section

An exception section

Correct

Correct

9.






The command fails because the function already exists.



Incorrect


10. one value.

A function must have at least one IN parameter, and must return exactly

Mark for Review

(1) Points

True

False (*)

Incorrect

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11.

You have created a function called USEFUL. You want every database user to

be able to invoke the function. Which command would you use to do this? (1) Points

GRANT EXECUTE ON useful TO *;

GRANT useful TO PUBLIC;

GRANT EXECUTE ON useful TO PUBLIC; (*)

GRANT useful TO WORLD;

GRANT TO PUBLIC EXECUTE ON useful;

Mark for Review

Incorrect


12.

JOE's schema contains a COUNTRIES table. The following commands are

executed by JOE and TOM: (JOE): GRANT SELECT ON countries TO tom WITH GRANT OPTION; (TOM): GRANT SELECT on joe.countries TO dick WITH GRANT OPTION; Now, JOE executes: REVOKE SELECT ON countries FROM tom; What happens to the grant to DICK?


DICK also loses his SELECT privilege. (*)

Nothing. DICK's privilege is preserved even though TOM lost his privilege.

The REVOKE statement fails because JOE must remove the SELECT privilege from both users at the same time.

The REVOKE statement fails because only the Database Administrator (not JOE) can revoke privileges.

Correct

Correct

13.

Why will the following statement fail?

SELECT employee_id, tax(p_value => salary) FROM employees;


The data type for the tax variable does not match the data type for salary.

User-defined functions are not allowed in the SELECT clause.

The statement will execute and not fail.

Name notation is not allowed. (*)

Incorrect


14.

User-defined functions can extend the power of SQL statements where

Oracle does not provide ready-made functions such as UPPER and LOWER. True or False? Mark for Review (1) Points

True (*)

False

Correct

Correct

15.

You want to create a function which can be used in a SQL statement. Which

one of the following can be coded within your function? Mark for Review (1) Points

One or more IN parameters (*)

An OUT parameter

section 9

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