1) http://www.sql-tutorial.com/sql-aggregate-functions-sql-tutorial/
2) http://www.w3schools.com/sql/sql_orderby.asp
3) http://www.1keydata.com/sql/sqlorderby.html
4) http://www.webcheatsheet.com/SQL/interactive_sql_tutorial/sql_orderby.php
5) http://www.techonthenet.com/sql/order_by.php
6) http://85.25.126.90/wiki/SQL_FAQ
7) http://www.java2s.com/Code/Oracle/CatalogOracle.htm
8) http://sqlzoo.net/
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