how to make qr code generator in vb.net Part 00: Part Title in .NET

Drawing Code 128 in .NET Part 00: Part Title

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Part 00: Part Title
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Part 1: Understanding Microsoft Access
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Contacts
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Bar Code Reader In C#
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3
Part 00: Part Title
Contact Company Company Company Company Company Company Company ID Name Address City State Postal Code Phone Website
Primary Key
Contact Contact Contact Contact Contact Contact Contact Name Address City State Postal Code Phone Email
3 3 3 3 3
Contact Events Contact Contact Contact Contact Follow- Product Product Product Invoice ID Date Event Event Up Date Category Name Price Number Time Notes
Primary Key Invoices Invoice Invoice Company Invoice Number Date Name Total
Primary Key
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Figure 3-9. The LawTrack Contacts database tables with primary keys defined.
Functional Dependence
Defining a primary key helps you better identify the true subject of the table. Now, you can check to see whether you included all the data relevant to the subject of the table and whether each of the fields in the table describes an attribute of the subject (and not some other subject). In relational terminology, you should check to see whether each field is functionally dependent on the primary key that defines the subject of the table. Rule 3: For each unique primary key value, the values in the data columns must be relevant to, and must completely describe, the subject of the table. This rule works in two ways. First, you shouldn t have any data in a table that is not relevant to the subject (as defined by the primary key) of the table. Second, the data in the table should completely describe the subject. Let s start by looking at the Contacts table as defined in Figure 3-9. The subject of this table is the people who are our contacts. We certainly need to know the company or organization with which a person is associated. What if a person has more than one such association
Part 1: Understanding Microsoft Access
Designing Your Database Application For example, a person might work for a company but also be a member of one or more professional organizations. We certainly do not want to repeat the contact name and personal address information multiple times for each different association. Is the Company information in a Contact row unique to the individual defined by that row Probably not. Even if we re certain that a person is associated with only one company or organization, we ll have to duplicate the company information in multiple rows when a company has more than one person associated with it. The solution is to identify companies (organizations) as a separate subject with its own unique identifier. If a person is related to one and only one company, we can place a linking copy of the Company ID in the Contacts table. In this case, let s assume that a person can be related to more than one company or organization. A company has many persons, and a person might belong to many companies or organizations. In relational terminology, this is called a many-to-many relationship, which you can read more about later in this chapter. To define this in our table design, we need what I call a linking table that stores the multiple relationships of the companies and people a table called Company Contacts. While we re at it, let s refine the Contact Name field by splitting it into separate First Name and Last Name fields (so we can sort and search by just the last name), and let s complete the Company Contacts table by adding an indicator field that defines which company is the primary one for the contact. Now, we should turn our attention to the Contact Events table. In the table shown in Figure 3-9, we have not only information about the event but also information about a product that might be sold during the event. In fact, the user of this database might make many calls or mail out many brochures or letters before actually selling a product. The product information isn t fully functionally dependent on the subject of this table, so it needs to be in a separate subject table. In fact, a product is not going to be purchased by an individual contact it will be bought by the contact s primary company or organization. So, we also need to create a separate Contact Products table to store the products a contact might purchase after dozens of contacts. This table should have all the information relevant to a company purchasing a product for an employee, but nothing extra. This moves the extra product information from the old Contact Events table and makes the fields in that table relevant only to events and nothing else. Finally, we should completely define the Invoices subject by adding other relevant information such as the purchasing company s purchase order number, the date the invoice payment is due, and an indicator field to mark when the invoice has been paid. You can see the result of applying Rule 3 in Figure 3-10 on the next page.
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