By Steve Conger
Hands-On Database makes use of a scenario-based strategy that exhibits readers tips on how to construct a database by means of offering them with the context of a working case all through every one step of the method.
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Extra info for Hands-on database
Then, with a glance at the clock, Sharon begins: “As Terry said, I am working on building a database to help keep track of tutoring. I hope it will make all your lives a little easier. To build it, I need to understand what you do better, and what you would like to see, so I am going to ask you some questions. We don’t have much time this morning, only about 30 minutes, so we are going to have to keep the answers pretty short. I will leave you with my email so you can let me know of things that you forgot about or didn’t have a chance to tell me or any questions you might have.
Statement of work 4. Primary key 5. 6. 7. 8. 9. 10. Data integrity Redundancy Delimited files Relational database Entity Relational design 11. SQL 12. Constraints 13. Fixed width files — a. A type of database that uses “relations,” tables, to store and relate tables. — b. The process of organizing data into tables or entities and then determining the relations among them. — c. The language relational databases use to create their objects and to modify and retrieve data. — d. These files have some sort of character separating columns of data.
There are some techniques that can help. One is to make a weighted average. To do this, write down your most optimistic time estimate— your best guess at the probable time it will take if everything goes perfect—and your most pessimistic time estimate—if everything goes wrong. Add them all together, but multiply your most probable estimate by 3, then divide the sum by five. (0 + Pt ϫ 3 + p) / 5 What other ways can you think of to help your time estimates be more accurate? Chapter 1 • Who Needs a Database REVIEWING THE STATEMENT OF WORK The following afternoon Sharon returns to Terry’s office and shows her the statement.