References
Reference NO 1
http://stackoverflow.com/questions/15195581/sql-counting-values-from-joined-tables
Reference NO 2
http://stackoverflow.com/questions/7676038/join-tables-count-based-on-value-in-column
Reference NO 3
http://stackoverflow.com/questions/4075018/sql-joining-two-tables-and-counting-items
Reference NO 4
http://stackoverflow.com/questions/11874188/sql-getting-the-count-of-one-table-and-join-the-others
Reference NO 5
http://stackoverflow.com/questions/8239562/sql-server-query-count-on-same-table-twice
Reference NO 6
http://developers.cartodb.com/tutorials/joining_data.html
Reference NO 7
#EANF#
Reference NO 8
#EANF#
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