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 Test: Quiz: Creating Tables

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عدد الرسائل : 344
تاريخ التسجيل : 21/03/2009

مُساهمةموضوع: Test: Quiz: Creating Tables   الجمعة 01 يونيو 2012, 19:05


Test: Quiz: Creating Tables

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

Section 1
(Answer all questions in this section)

1. CREATE TABLE student_table
(id NUMBER(6),
lname VARCHAR(20),
fname VARCHAR(20),
lunch_num NUMBER(4));
Which of the following statements best describes the above SQL statement:

Mark for Review
(1) Points


Creates a table named student_table with four columns: lname, fname, lunch, num


Creates a table named student with four columns: id, lname, fname, lunch_num


Creates a table named student_table with four columns: id, lname, fname, lunch_num (*)


Creates a table named student_table with four columns: lname, fname, lunch, num



Correct


2. I have a table named School_Friends in my schema. You want to build a table in your schema named School_Friends. This is ______________, because ____________________________________. Mark for Review
(1) Points


possible; my schema is separate from yours, and it is okay for us to have like-named tables in our separate schemas. (*)


possible; our data will merge into one table, and we can more easily access our mutual friends information.


impossible; no matter what, there can never be two tables with the same name, even if they are in separate schemas.


impossible; School_Friends is a reserved term in SQL.



Correct


3. When creating a new table, which of the following naming rules apply. (Choose three) Mark for Review
(1) Points

(Choose all correct answers)


Must begin with a letter (*)


Can have the same name as another object owned by the same user


Must contain ONLY A - Z, a - z, 0 - 9, _ (underscore), $, and # (*)


Must be an Oracle reserved word


Must be between 1 to 30 characters long (*)



Correct


4. CREATE TABLE bioclass
(hire_date DATE DEFAULT SYSDATE,
first_name varchar2(15),
last_name varchar2(15));
The above CREATE TABLE statement is acceptable, and will create a Table named bioclass that contains a hire_date, first_name and last_name column. True or False?

Mark for Review
(1) Points


True (*)


False



Correct


5. DCL, which is the acronym for Data Control Language, allows: Mark for Review
(1) Points


The ALTER command to be used.


A Database Administrator the ability to grant privileges to users. (*)


The TRUNCATE command to be used.


The CONROL TRANSACTION statement can be used.



Correct


6. It is possible to create a table by using the CREATE TABLE command in conjunction with a subquery. True or False? Mark for Review
(1) Points


True (*)


False



Correct


7. Given this employee table:
(employee_id NUMBER(10) NOT NULL,
first_name VARCHAR2(25) NOT NULL,
last_name VARCHAR2(30) NOT NULL,
hire_date DATE DEFAULT sysdate)

What will be the result in the hire_date column following this insert statement:

INSERT INTO employees VALUES (10, 'Natacha', 'Hansen', DEFAULT);

Mark for Review
(1) Points


Statement will fail, as you must list the columns into which you are inserting.


Statement will work and the hire_date column will have the value of the date when the statement was run. (*)


The character string SYSDATE.


The column for hire_date will be null.



Correct


8. Examine this CREATE TABLE statement:
CREATE TABLE emp_load
(employee_number CHAR(5),
employee_dob CHAR(20),
employee_last_name CHAR(20),
employee_first_name CHAR(15),
employee_middle_name CHAR(15),
employee_hire_date DATE)
ORGANIZATION EXTERNAL
(TYPE ORACLE_LOADER
DEFAULT DIRECTORY def_dir1
ACCESS PARAMETERS
(RECORDS DELIMITED BY NEWLINE
FIELDS (employee_number CHAR(2),
employee_dob CHAR(20),
employee_last_name CHAR(18),
employee_first_name CHAR(11),
employee_middle_name CHAR(11),
employee_hire_date CHAR(10) date_format DATE mask "mm/dd/yyyy"))
LOCATION ('info.dat'));

What kind of table is created here?

Mark for Review
(1) Points


An external table with the data stored in a file outside the database. (*)


A View.


An external table with the data stored in a file inside the database.


None. This is in invalid statement.



Correct


9. Once they are created, external tables are accessed with normal SQL statements? (True or False) Mark for Review
(1) Points


True (*)


False


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