References
Reference NO 1
http://stackoverflow.com/questions/15189779/merging-two-identical-select-queries
Reference NO 2
http://stackoverflow.com/questions/6563330/merging-two-select-queries
Reference NO 3
http://pic.dhe.ibm.com/infocenter/dzichelp/v2r2/topic/com.ibm.db2z10.doc.apsg/src/tpc/db2z_combineresultmultipleselect.htm
Reference NO 4
http://support.sas.com/documentation/cdl/en/sqlproc/62086/HTML/default/viewer.htm#a001361224.htm
Reference NO 5
http://databases.about.com/od/sql/a/union.htm
Reference NO 6
http://office.microsoft.com/en-us/access-help/use-a-union-query-to-combine-multiple-queries-into-a-single-result-HA102749627.aspx
Reference NO 7
http://dba.stackexchange.com/questions/11367/how-to-join-two-table-and-show-one-query-result-in-mysql
Reference NO 8
http://www.tutorialspoint.com/sql/sql-unions-clause.htm
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