References
Reference NO 1
http://stackoverflow.com/questions/15201219/naming-referring-joined-tables
Reference NO 2
http://publib.boulder.ibm.com/infocenter/iseries/v5r3/topic/db2/rbafzmstc2cornm.htm
Reference NO 3
http://office.microsoft.com/en-us/access-help/access-sql-from-clause-HA010276924.aspx
Reference NO 4
http://support.sas.com/documentation/cdl/en/proc/61895/HTML/default/a002473691.htm
Reference NO 5
http://dev.mysql.com/doc/refman/5.0/en/multiple-tables.html
Reference NO 6
http://bytes.com/topic/sql-server/answers/503902-ambiguous-column-names-multi-table-join
Reference NO 7
http://help.arcgis.com/en/arcgisdesktop/10.0/help/005s/005s0000002p000000.htm
Reference NO 8
http://docs.oracle.com/cd/B19306_01/server.102/b14200/queries006.htm
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