TJ Willard CSC 1302 Chapter 9.docx

TJ Willard CSC 1302 Chapter 9.docx - CH 9 DATABASE Labs...

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CH 9. DATABASE Labs Instructor: Mrs. Jackson Complete each assignment for full credit: (Pg. 519) Chapter Review Problems: 9.1, 9.2, 9.4, 9.14 9.1 Summarize the distinction between a flat file and a database 9.2 What is meant by data independence?? 9.4 What is the difference between a schema and a subschema? ? 9.13 Using the commands SELECT, PROJECT, and JOIN, write a sequence of instructions to answer each of the following questions about parts and their manufacturers in terms of the following database: Which companies make Bolt 2Z? Obtain a list of the parts made by Company X along with each part’s cost. Which companies make a part with weight 1? ? Schema is a description of the entire database structure that is used be the database software to maintain the database and subschema is a description of only that portion of the database pertinent to a particular
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