An introduction to abstract mathematical systems by David M. Burton PDF

By David M. Burton

ISBN-10: 0201007215

ISBN-13: 9780201007213

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For example, the partners may have their own fax lines, although other employees do not. An obvious way to handle this is to add a fax column to the Contacts Table. However, you should use this column only for personal fax numbers and should set it to NULL for employees who do not have their own fax numbers. You can then write your queries to return the shared fax number if no personal fax number is found. If you fail to do this and you insert the common fax number for each employee, you will be duplicating data.

The SQL command used to remove a database is as simple as the CREATE DATABASE command. The SQL DROP command is used: DROP DATABASE CONTACTS; Relational databases store data in tables. Most databases may contain a number of different tables, each containing different types of data, depending on the application. Tables are intended to store logically related data items together, so a database may contain one table for business contacts, another for projects, and so on. -6 0- Chapter 3:SQL Basics A table is a set of data records, arranged as rows, each of which contains individual data elements or fields, arranged as columns.

An obvious way to handle this is to add a fax column to the Contacts Table. However, you should use this column only for personal fax numbers and should set it to NULL for employees who do not have their own fax numbers. You can then write your queries to return the shared fax number if no personal fax number is found. If you fail to do this and you insert the common fax number for each employee, you will be duplicating data. com 100 Oliver 1 Dewey Howe cell 555-123-456 444-123-333 9 5 Having dealt with the lower levels of client data, you are now ready to create the Client Table itself.

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An introduction to abstract mathematical systems by David M. Burton


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