Download Beginning VB 2008 Databases: From Novice to Professional by Vidya Vrat Agarwal PDF
By Vidya Vrat Agarwal
Starting VB 2008 Databases is for each VB programmer. This publication assumes no past database adventure, and teaches, regularly via hands-on examples, tips on how to create and use relational databases with the traditional database language SQL and the way to entry them with VB. virtually each program must entry a database, and this publication concisely teaches the entire basics needed—and so much which are ever needed—to increase expert database purposes.
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Extra info for Beginning VB 2008 Databases: From Novice to Professional (Beginning: from Novice to Professional)
Cardinality refers to the uniqueness of data values contained in a particular column of a database table. The term relational database refers to the fact that different tables quite often contain related data. For example, one sales rep in a company may take many orders, which were placed by many customers. The products ordered may come from different suppliers, and chances are that each supplier can supply more than one product. All of these relationships exist in almost every database and can be classified as follows: One-to-One (1:1) For each row in Table A, there is at most only one related row in Table B, and vice versa.
This is the most common relationship. An example of a one-to-many relationship of tables in Northwind is shown in Figure 3-1. Note the Customers table has a CustomerID field as the primary key (indicated by the key symbol on the left), which has a relation with the CustomerID field of the Orders table; CustomerID is considered a foreign key in the Orders table. The link shown between the Customers and Orders tables indicates a one-to-many relationship, as many orders can belong to one customer.
Performance: Server databases usually have huge hardware support, and so servers running these databases have large amounts of RAM and multiple CPUs, and this is why server databases support rich infrastructure and give optimum performance. • Scalability: This property allows a server database to expand its ability to process and store records even if it has grown tremendously. The Database Life Cycle The database life cycle defines the complete process from conception to implementation. The entire development and implementation process of this cycle can be divided into small phases; only after the completion of each phase can you move on to the next phase, and this is the way you build your database block by block.