barcode generator in vb.net code project SQL Demysti ed in Software

Create PDF417 in Software SQL Demysti ed

SQL Demysti ed
Read PDF-417 2d Barcode In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Create PDF 417 In None
Using Barcode encoder for Software Control to generate, create PDF-417 2d barcode image in Software applications.
RETAIL PRICE DVD 19.96 19.96 29.99 19.99
Recognizing PDF417 In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
PDF-417 2d Barcode Creation In C#.NET
Using Barcode generator for .NET Control to generate, create PDF 417 image in .NET applications.
YEAR PRODUCED 2003 2003 2003 2003
Generate PDF 417 In Visual Studio .NET
Using Barcode drawer for ASP.NET Control to generate, create PDF 417 image in ASP.NET applications.
Draw PDF417 In Visual Studio .NET
Using Barcode generation for .NET Control to generate, create PDF 417 image in .NET framework applications.
Figure 1-7
PDF-417 2d Barcode Printer In Visual Basic .NET
Using Barcode maker for Visual Studio .NET Control to generate, create PDF417 image in .NET framework applications.
GS1 128 Printer In None
Using Barcode encoder for Software Control to generate, create GS1 128 image in Software applications.
Third normal form relation
Print Data Matrix 2d Barcode In None
Using Barcode generation for Software Control to generate, create Data Matrix 2d barcode image in Software applications.
Create Barcode In None
Using Barcode maker for Software Control to generate, create bar code image in Software applications.
Relational Database Concepts
Code 128B Encoder In None
Using Barcode creator for Software Control to generate, create Code 128 Code Set C image in Software applications.
Code 3/9 Printer In None
Using Barcode creator for Software Control to generate, create Code39 image in Software applications.
column of the relation. However, they serve other important purposes, such as controlling the values of the codes themselves and providing a convenient source for a list of valid code values that might be used in a pull-down list on a web page form. One other design change made to achieve third normal form had to do with the Retail Price in the Movie Copy relation as shown in Figure 1-6. After discussion with the store manager, it was determined that the price depends on the combination of Movie ID and Media Format, with all copies having the same Movie ID and Media Format getting the same price. This is clearly a transitive dependency and therefore a violation of third normal form. The normal solution for such a problem would be to create a relation named Movie Price with a unique identi er of Movie ID and Media Format, and then to move the Retail Price from Movie Copy to the new relation. However, during the discussion with the store manager, she indicated that they were in the process of discontinuing VHS format movies because very few customers wanted them, and that within a few months, the store would handle only DVDs. With that news in mind, I decided to move the price to two columns in the Movie table, one for the DVD price, and the other for the VHS price. While it could be argued that this is a rst normal form violation (and technically speaking, it is), it seemed the best compromise. Database design isn t always an exact science, so there is often a bit of room for adjustments provided the designer always considers the potential consequences (measured in terms of data anomalies) of each compromise.
Code 9/3 Encoder In None
Using Barcode encoder for Software Control to generate, create Uniform Symbology Specification Code 93 image in Software applications.
Print 2D Barcode In .NET Framework
Using Barcode encoder for .NET Control to generate, create Matrix 2D Barcode image in VS .NET applications.
Beyond Third Normal Form
Generate Code 3/9 In None
Using Barcode creation for Online Control to generate, create ANSI/AIM Code 39 image in Online applications.
1D Creation In VS .NET
Using Barcode generator for ASP.NET Control to generate, create 1D Barcode image in ASP.NET applications.
Dr. E. F. Codd participated in the de nition of a stronger version of third normal form called Boyce-Codd normal form. Various other authors and researchers have offered their extensions under the names fourth normal form, fth normal form, and domain-key normal form, among others. In my experience, it takes a bit of practice with normalization before these extensions make a whole lot of sense. Moreover, third normal form covers just about every anomaly you will nd in everyday database design work.
UPC - 13 Creation In None
Using Barcode creation for Excel Control to generate, create EAN / UCC - 13 image in Microsoft Excel applications.
Bar Code Encoder In Objective-C
Using Barcode creation for iPad Control to generate, create bar code image in iPad applications.
Overview of the Video Store Sample Database
Drawing UPC A In VB.NET
Using Barcode encoder for VS .NET Control to generate, create Universal Product Code version A image in .NET framework applications.
DataMatrix Creation In None
Using Barcode drawer for Microsoft Word Control to generate, create ECC200 image in Word applications.
All of the examples used in this book are based on a database for a ctitious video store. The SQL statements required to create the database objects and populate them with data can be downloaded as described later in this chapter. Figure 1-8
MOVIE <pk> MOVIE ID MOVIE_GENRE_CODE <fk1> MPAA_RATING_CODE <fk2> MOVIE_TITLE RETAIL_PRICE_VHS RETAIL_PRICE_DVD YEAR_PRODUCED
SQL Demysti ed
MPAA_RATING <pk> MPAA RATING CODE MPAA_RATING_DESCRIPTION
MOVIE_GENRE MOVIE GENRE CODE
<pk>
MOVIE_GENRE_DESCRIPTION
MOVIE_LANGUAGE MOVIE ID <pk,fk2> LANGUAGE CODE <pk,fk1> MOVIE_COPY MOVIE ID <pk,fk> COPY NUMBER <pk> DATE_ACQUIRED DATE_SOLD MEDIA_FORMAT MOVIE_RENTAL <pk,fk1> MOVIE ID <pk,fk1> COPY NUMBER TRANSACTION ID <pk,fk2> DUE_DATE RENTAL_FEE LATE_OR_LOSS_FEE RETURNED_DATE
LANGUAGE LANGUAGE CODE LANGUAGE_NAME <pk>
CUSTOMER_ACCOUNT_PERSON CUSTOMER ACCOUNT ID <pk,fk2> PERSON ID <pk,fk1>
CUSTOMER_ACCOUNT CUSTOMER ACCOUNT ID <pk> CUSTOMER_HOLD_IND DATE_ENROLLED DATE_TERMINATED CUSTOMER_DEPOSIT_AMOUNT CREDIT_CARD_ON_FILE_INDIC CHILD_RENTAL_ALLOWED_INDIC
CUSTOMER_TRANSACTION <pk> TRANSACTION ID CUSTOMER_ACCOUNT_ID <fk2> EMPLOYEE_PERSON_ID <fk1> TRANSACTION_DATE SALES_TAX
PERSON PERSON ID <pk> PERSON_GIVEN_NAME PERSON_MIDDLE_NAME PERSON_FAMILY_NAME PERSON_ADDRESS_1 PERSON_ADDRESS_2 PERSON_ADDRESS_CITY PERSON_ADDRESS_STATE_PROV PERSON_ADDRESS_POSTAL_CODE PERSON_ADDRESS_COUNTRY PERSON_PHONE BIRTH_DATE DEATH_DATE
EMPLOYEE PERSON ID <pk,fk1> SUPERVISOR_PERSON_ID <fk2> EMPLOYEE_TAX_ID EMPLOYEE_JOB_CATEGORY EMPLOYEE_HOURLY_RATE HIRE_DATE TERMINATION_DATE
Figure 1-8 Video store Entity Relationship Diagram (ERD)
presents the entity relationship diagram (ERD) for the entire video store database. A brief description of each table appears here so you may familiarize yourself with the database design, which will help you understand the examples as you start learning SQL in the next chapter. The video store for which the sample database was designed is a small familyowned and operated store that rents and sells videos in both VHS and DVD formats. However, the VHS format is being discontinued. The store manager expects to expand into other product lines, such as snack foods, but the plans to do so were not rm enough to be included in the current database design. Table 1-1 gives some information about each table included in the design. Table 1-2 gives some information about the columns in the database tables.
Copyright © OnBarcode.com . All rights reserved.