How get only one result for each company in the table?

How get only one result for each company in the table?

References

Reference NO 1

http://stackoverflow.com/questions/15165431/how-get-only-one-result-for-each-company-in-the-table

Reference NO 2

http://www.elevatesoft.com/manual?action=viewtopic&id=dbisam4&product=rsdelphi&version=XE&topic=SELECT_Statement

Reference NO 3

http://ww2.cis.temple.edu/cis109friedman/cis%20109%20-%20lecture%20set%20iv%20-%20sql/aaa%20lecture%20set%203%20-%20sql-qbe%20ver%205.htm

Reference NO 4

http://msdn.microsoft.com/en-us/library/windows/desktop/ms710199(v=vs.85).aspx

Reference NO 5

http://www.sql-ex.ru/help/select13.php

Reference NO 6

http://dev.mysql.com/doc/refman/5.5/en/join.html

Reference NO 7

http://www.commandprompt.com/ppbook/x5802

Reference NO 8

http://javarevisited.blogspot.com/2011/10/selct-command-sql-query-example.html