By John Petersen
Absolute Beginner's advisor to Databases brings the weather of a database jointly utilizing effortless to appreciate language, ideal for the real newbie. It not just supplies particular arms on perform, but in addition presents an summary of designing, protecting and utilizing a database. This ebook covers what databases are used for, why databases are very important, why the layout of the database is critical, database normalization, keys to sturdy database layout, transformations in different types of databases, and indexes--what they're, how we use them, and why they're very important.
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Extra info for Absolute Beginner s Guide to Databases
What if multiple employees could book an order? Perhaps the organization uses teams of employees to book orders. If this is the case, the current database design could not meet this requirement. Enter the concept of the many-to-many relationship. Suppose, hypothetically, that more than one employee needs to book an order. Looking at the current relationships, the Employee table is the parent and the Orders table is the child. You already know that an EmployeeID field exists in the Orders table and that only one EmployeeID value can be stored in the field.
Some believe that systems and databases are never “complete” because the business environment constantly evolves and changes. At some point, you will acquire enough information to establish an initial database design. Just because you create that first design does not mean the requirements-gathering process is complete. Remember, you might have to repeat the process two, three, or perhaps four or more times to achieve that first database design. As you gain experience, the process will become more familiar to you.
9 shows the query definitions for the Northwind Traders Database. 9 A wide variety of queries are defined in the Northwind Traders Database. The best way to illustrate queries is with a simple example. The requirement is a simple alphabetical product listing for active products. In a query such as this, you need only two pieces of information: the product ID and the product name. The Current Product List query fulfills these requirements. The steps to viewing the contents of a query are exactly the same as viewing the contents of a table: 1.
Absolute Beginner s Guide to Databases by John Petersen