By Andy Oppel
"Now you could layout, construct, and deal with an absolutely sensible database conveniently. completely up to date to hide the newest applied sciences and methods, Databases Demystified, moment version promises the hands-on assist you have to start. Written in a step by step layout, this sensible advisor covers tools that may be used with any database, together with Microsoft entry, MySQL, Microsoft SQL Server, and Oracle. you are going to know about relational database parts, database queries, SQL, the database existence cycle, logical database layout utilizing normalization, and actual database layout. facts and procedure modeling, database defense, on-line Analytical Processing (OLAP), and XML also are covered." -- again conceal. learn more... Database basics -- Exploring relational database parts -- Forms-based database queries -- creation to SQL -- The database lifestyles cycle -- Logical database layout utilizing normalization -- info and method modeling -- actual database layout -- Connecting databases to the surface international -- Database safeguard -- Database implementation -- Databases for on-line analytical processing -- Integrating XML files and items into databases
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The sudden explosion of the Internet and the Web created a sharp demand for mainstream delivery of complex data. An object is a logical grouping of related data and program logic that represents a real-world thing, such as a customer, employee, order, or product. Individual data items, such as customer ID and customer name, are called variables in the OO model and are stored within each object. In OO terminology, a method is a piece of application program logic that operates on a particular object and provides a finite function, such as checking a customer’s credit limit or updating a customer’s address.
Learning to read relationships takes practice, and learning to define and draw them correctly takes a lot of practice. The trick is to think about the association between the entities in one direction and then to reverse your perspective to think about it in the opposite direction. ” Relationships may thus be classified into three types: one-to-one, one-to-many, and many-to-many, as discussed in the following sections. Some people will say manyto-one is also a relationship type, but in reality, it is only a one-to-many relationship looked at with a reverse perspective.
Require the user or application program to relate one file to another B. Require the user or application to know the contents of each file C. Are not really databases by themselves, even though some vendors call them that D. Provide no logical data independence when used directly by application programs E. Can be used to store the database objects for a database 3. The hierarchical database model: A. Stores data and methods together in the database B. Was first developed by Dr. Peter Chen C. In its pure form, permits only one parent for any given record D.
Databases demystified by Andy Oppel