DATABA SE DES IGN AN D CREA TION in Font

Creator PDF417 in Font DATABA SE DES IGN AN D CREA TION

CHAPTER 3 DATABA SE DES IGN AN D CREA TION
Paint PDF 417 In None
Using Barcode generation for Font Control to generate, create PDF-417 2d barcode image in Font applications.
www.OnBarcode.com
UCC-128 Encoder In None
Using Barcode generator for Font Control to generate, create UCC - 12 image in Font applications.
www.OnBarcode.com
needs to be split into customer details such as name and address, and customer products, such as a row for each product bought with the customer details about that product. We have now reached full normalization to 3NF of the tables within our database. Let s take a moment to clarify where we are now. Figure 3-6 shows that we re now moving from a logical model to a physical model, where we are physically defining what information is stored where.
UPC Symbol Encoder In None
Using Barcode drawer for Font Control to generate, create UPCA image in Font applications.
www.OnBarcode.com
Generate Barcode In None
Using Barcode maker for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Figure 3-6. Physical database model
Generate Code 128 Code Set B In None
Using Barcode generator for Font Control to generate, create Code 128B image in Font applications.
www.OnBarcode.com
Quick Response Code Printer In None
Using Barcode maker for Font Control to generate, create QR-Code image in Font applications.
www.OnBarcode.com
Denormalization
PDF-417 2d Barcode Generation In None
Using Barcode drawer for Font Control to generate, create PDF 417 image in Font applications.
www.OnBarcode.com
Make Royal Mail Barcode In None
Using Barcode creation for Font Control to generate, create Royal Mail Barcode image in Font applications.
www.OnBarcode.com
Despite having normalized our data to be more efficient, there will be times when denormalizing the data is a better option. Denormalization is the complete opposite of normalization: it is where you introduce data redundancy within a table to reduce the number of table joins and potentially speed up data access. Instances of denormalization can be found in production systems where the join to a table is slowing down queries, or perhaps where normalization is not required (e.g., when working with a system in which the data is not regularly updated). Just because others say your data should be totally normalized, this is not necessarily true, so don t feel forced down that route. The drawback of denormalizing your data too far, though, is that you ll be holding duplicate and unnecessary information that could be normalized out to another table and then just joined during a query. This will, therefore, create performance issues as well as use a larger amount of data storage space. However, the costs of denormalization can be justified if queries run faster. That said, data integrity is paramount in a system. It s no use having denormalized
PDF 417 Maker In None
Using Barcode creation for Font Control to generate, create PDF-417 2d barcode image in Font applications.
www.OnBarcode.com
Recognizing PDF417 In C#
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
CHAPTER 3 DATABA SE DES IGN AN D C REA TION
Reading USS Code 39 In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Encode UPC - 13 In Visual Basic .NET
Using Barcode creator for .NET framework Control to generate, create EAN 13 image in .NET framework applications.
www.OnBarcode.com
data in which there are duplications of data where one area is updated when there s a change, and the other area isn t updated. Denormalization is not the route we want to take in our database example, so now that we have all the data to produce the system, it s time to look at how these tables will link together.
Printing Code 39 In Java
Using Barcode generator for Java Control to generate, create ANSI/AIM Code 39 image in Java applications.
www.OnBarcode.com
Creating Code 128C In Java
Using Barcode generation for Java Control to generate, create Code 128 Code Set A image in Java applications.
www.OnBarcode.com
Creating the Sample Database
2D Drawer In Visual Basic .NET
Using Barcode creation for Visual Studio .NET Control to generate, create Matrix Barcode image in VS .NET applications.
www.OnBarcode.com
Decode Data Matrix ECC200 In Visual C#
Using Barcode reader for .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Let s now begin to create our example database. In this section, we ll examine two different ways to create a database in SQL Server: Using the SQL Server Management Studio graphical interface Using T-SQL code Both methods have their own merits and pitfalls for creating databases, as you ll discover, but these two methods are used whenever possible throughout the book, and where you might find one method is good for one task, it might not be ideal for another. Neither method is right or wrong for every task, and your decision of which to use basically comes down to personal preference and what you re trying to achieve at the time. You may find that using T-SQL code for building objects provides the best results, as you will see instantly the different possible selections. However, if the syntax for the commands is not familiar to you, you may well choose to use a wizard or SQL Server Management Studio. Once you become more comfortable with the syntax, then a Query Editor pane might become your favored method. We ll also examine how to drop a database in SQL Server Management Studio.
UPC - 13 Encoder In Visual Studio .NET
Using Barcode creator for ASP.NET Control to generate, create EAN-13 image in ASP.NET applications.
www.OnBarcode.com
GS1 - 13 Encoder In .NET Framework
Using Barcode drawer for VS .NET Control to generate, create EAN-13 image in .NET framework applications.
www.OnBarcode.com
Creating a Database in SQL Server Management Studio
Drawing Universal Product Code Version A In Java
Using Barcode drawer for Java Control to generate, create UPC Code image in Java applications.
www.OnBarcode.com
Scan Barcode In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
www.OnBarcode.com
The first method of creating a database we ll look at is using SQL Server Management Studio, which was introduced in 2.
Try It Out: Creating a Database in SQL Server Management Studio
1. Before creating the database, you ll need to start up SQL Server Management Studio.
Tip
Throughout the book examples, I m working on a server called FAT-BELLY using the default installed instance. Replace your server and instance where appropriate.
2. Ensure that you have registered and connected to your server. If the SQL Server service was not previously started, it will automatically start as you connect, which may take a few moments. However, if you have not shut down your computer since the install of SQL Server, then everything should be up and running. SQL Server will only stop if you have shut down your computer and indicated not to start the SQL Server service automatically. To start SQL Server, or conversely, if you want to set up SQL Server not to start automatically when Windows starts, set this either from Control Panel or from the SQL Server Configuration Manager found under Programs Microsoft SQL Server 2008 Configuration Tools. 3. In Object Explorer, expand the Databases node until you see either just the system database and database snapshot nodes that always exist, or, on top of these, the individual sample databases you installed earlier in the book. Ensure that the Databases folder is highlighted and ready for the next action, as shown in Figure 3-7.
Copyright © OnBarcode.com . All rights reserved.