Phone directory,daniel francisco,reverse phone number lookup with name - Step 3

admin | Category: Sex Crime Offender | 26.09.2013
The rise of the Internet and smart phones in the 21st Century greatly reduced the need for a paper phone book. In the US, under current rules and practices, mobile phone and Voice over IP listings are not included in telephone directories.
A telephone directory and its content may be known by the color of the paper it is printed on. A reverse telephone directory is sorted by number, which can be looked up to give the name and address of the subscriber.
Imagine a real world problem of storing information like names, addresses, phone numbers and other information for all the people in a country. The way indexing in done in the telephone directory is a bit different than what is done in the MSSQL server. Finally the range will get smaller and smaller until we can point to a single page with phone numbers and other information in it.


In SQL language we call the telephone number field in our telephone directory to be cluster indexed. For cases where we need to find other information for a certain telephone number a our modified telephone directory is enough but for cases where we need to find phone numbers for a given first name it is almost useless.
But for a fee, subscribers may request the exclusion of their number from the directory, primarily for privacy and security concerns. In the latter case, the directory can be provided as an online service through proprietary terminals or over the Internet, or on physical media such as CD-ROM.
Use the New Ultimates white pages directory to find information on lost friends or relatives.
To resolve this we might be tempted to create a separate directory which lists data on first name basis. The server maintains a b-tree of the first names but at the leaf instead of attaching details like phone numbers, last names etc.


In many countries directories are both published in book for and also available over the Internet. However, if we need to the name of a person with a certain phone number we will have a few options but to start searching from the start of the list till we find the person. For our pupose if we imagine a telephone directory which oderers by telephone number first concepts might be easier to explain.



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Comments to Phone directory

  1. Yalqiz_Oglan — 26.09.2013 at 11:49:45 Are not happy afterward referred to as me with have to nail to a cross in order to get this.
  2. oskar — 26.09.2013 at 10:12:45 That clearly crosses no privacy rights.
  3. SeNaToR — 26.09.2013 at 13:30:10 For every single individual record or image each and every application, and other varying costs for.