Tài liệu Teach Yourself Electricity & Electronics P1 doc

... 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...

Ngày tải lên: 13/12/2013, 01:16

... 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...

Ngày tải lên: 22/12/2013, 21:18

... 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...

Ngày tải lên: 13/12/2013, 01:15

... 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...

Ngày tải lên: 13/12/2013, 01:15

... 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...

Ngày tải lên: 19/01/2014, 18:20

... 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 ......

Ngày tải lên: 15/12/2013, 05:15

... 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...

Ngày tải lên: 15/12/2013, 05:15

... ADD_MON Function 1: SQL> EXECUTE debug.erase; 2: 3: PL/SQL procedure successfully completed. 4: 5: SQL> 6: SQL> The built-in ADD_MONTHS function keeps the date at 7: SQL> the end of the ... SQL> 30: SQL> SELECT TO_CHAR( 31: 2 ADD_MON(TO_DATE(‘15-FEB-2000’,’DD-MON-YYYY’),1), 32: 3 ‘DD-MON-YYYY’) 33: 4 FROM dual; 34: 35: TO_CHAR(ADD 36: 37: 15-MAR-2000 38: 39: SQL> 40: SQ...

Ngày tải lên: 15/12/2013, 05:15

... 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...

Ngày tải lên: 15/12/2013, 05:15

... 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...

Ngày tải lên: 15/12/2013, 05:15