... Companies.
Click here for terms of use.
Teach Yourself
Electricity and
Electronics
Preface
This book is for people who want to learn basic electricity, electronics, and com-
munications concepts ... is divided into four major sections: Direct Current, Alternating Cur-
rent, Basic Electronics, and Advanced Electronics and Related Technology. At the
end of each section is a multip...
... have a motor that
changes electricity into useful mechanical energy.
A magnetic field contains energy of a unique kind. The science of magnetism is
closely related to electricity. Magnetic phenomena ... conductors of electricity. This is because the atoms or
molecules are usually too far apart to allow a free exchange of electrons. But if a gas be-
comes ionized, it is a fair conductor of...
... Companies.
Click here for terms of use.
Teach Yourself
Electricity and
Electronics
Preface
This book is for people who want to learn basic electricity, electronics, and com-
munications concepts ... 310
Calculation of power factor 310
How much of the power is true? 313
xii Contents
Teach Yourself
Electricity and
Electronics
Third Edition
Stan Gibilisco
McGraw-Hill
New York...
... have a motor that
changes electricity into useful mechanical energy.
A magnetic field contains energy of a unique kind. The science of magnetism is
closely related to electricity. Magnetic phenomena ... conductors of electricity. This is because the atoms or
molecules are usually too far apart to allow a free exchange of electrons. But if a gas be-
comes ionized, it is a fair conductor of...
... switch
between program windows.
In Chapter 3, “Creating and Editing Documents,” you
learn how to create and open documents, edit
document text, and save and print your work.
Chapter 4, “Working ... logo, Visual, the Visual logo,
Teach Yourself VISUALLY, Read Less - Learn More, and
related trade dress are trademarks or registered trademarks of
John Wiley & Sons, Inc. and/or its af...
... line to execute the
parts
procedure and to display the debugging information:
SQL> execute emp_change_s
SQL> execute emp_change_s
The following are the results of these statements being ... is
BEGIN
RETURN begin_date > :start_date;
END;
PROCEDURE compute_sales (sales_in in date) RETURN boolean overloaded
example of procedure is
BEGIN
RETURN sales_in > :sales_target;
END;
When ......
... 229
8
e_emp_dept INTEGER;
BEGIN
e_id:=&employee_id;
e_emp_dept:=&employee_department_id;
INSERT into employee values
(e_id, ‘&i_name’,&i_super,&i_rate,’&i_type’);
INSERT into emp_dept ... database. The following are the Pseudocolumns we will discuss:
CURRVAL
,
NEXTVAL
,
ROWID
, and
ROWNUM
.
CURRVAL
and
NEXTVAL
Pseudocolumns
The
CURRVAL
and
NEXTVAL
pseudocolumns are us...
... CLOB_LOCATOR
1 Teach Yourself Oracle8 in 21 Days
2 Oracle Data Warehousing Unleashed
3 Teach Yourself Database Development With Oracle in 21 Days
4 Oracle Unleashed 2E
5 Teach Yourself Oracle8 ... after the transaction is executed:
SQL>INSERT INTO TABLE employee VALUES
SQL>(emp_id, emp_name)
SQL>VALUES (5, “Jacks Sharon”)
1 row created
SQL> COMMIT;
Commit completed
Y...
... 485
17
larger than the default of 20,000 characters. Another reason to call
DBMS_OUTPUT.ENABLE
yourself would be if SQL*Plus isn’t the destination for your messages.
The Syntax for the
DBMS_OUTPUT.ENABLE
Procedure
DBMS_OUTPUT.ENABLE ... converted to text, and then
written to the buffer. It’s usually best to convert things to text yourself, so that you can
control the output format.
The f...