By Philip J. Pratt, Mary Z. Last
A advisor TO SQL, 8E, remains to be the fundamental SQL reference. It builds at the good fortune of prior variations by way of proposing easy SQL instructions within the context of a working case during which a enterprise makes use of SQL to control orders, components, clients, and revenues reps. The e-book covers the basics of SQL programming utilizing simple guideline and large hands-on routines. carrying on with with its concentrate on studying the fundamentals whatever the database surroundings selected, this variation good points examples from the newest databases: Oracle 11g, entry 2007, and MySQL. The 8th version expands at the use of working case reports via including a 3rd operating case to the large hands-on pedagogy on the finish of each bankruptcy.
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Extra info for A Guide to SQL (8th Edition)
5 2 7/12/2010 14 7 5 Owner accident caused damage to forward portion of port side. Technician has scheduled repair. 6 0 7/13/2010 15 11 7 Canvas leaks around zippers in heavy rain. Install overlap around zippers to prevent leaks. Overlap has been created. Installation has been scheduled. 8 3 7/17/2010 FIGURE 1-12 Sample data about service requests at Alexamara Marina Group (continued) The Alexamara Marina Group exercises at the end of this chapter will give you a chance to check your understanding of the data in this database.
Database Design Requirements The analyst has interviewed users and examined documents at Premiere Products and has determined that the database must support the following requirements: 1. 2. 3. 4. For a sales rep, store the sales rep’s number, last name, first name, street address, city, state, zip code, total commission, and commission rate. For a customer, store the customer’s number, name, street address, city, state, zip code, balance, and credit limit. In addition, store the number, last name, and first name of the sales rep who represents this customer.
If you wanted to be formal, you would precede either expression with the word functionally. ” You can also define functional dependency by saying that when you know a sales rep’s pay class, you can determine his or her commission rate. In a relational database, column B is functionally dependent on another column (or a collection of columns), A, if at any point in time a value for A determines a single value for B. You can think of this as follows: when you are given a value for A, do you know that Database Design Fundamentals 30 you can find a single value for B?