http://www.interviewquestionspdf.com/2014/07/group-by-sql-interview-queries.html
http://www.interviewquestionspdf.com/2014/07/sql-queries-interview-questions-answers.html
Query optimizer
http://docs.oracle.com/cd/B19306_01/server.102/b14211/optimops.htm#g92116
https://asktom.oracle.com/pls/apex/f?p=100:16:0::NO:16:P16_DATE_YYYYMMDD:20140326
http://www.interviewquestionspdf.com/2014/07/sql-queries-interview-questions-answers.html
Query optimizer
http://docs.oracle.com/cd/B19306_01/server.102/b14211/optimops.htm#g92116
https://asktom.oracle.com/pls/apex/f?p=100:16:0::NO:16:P16_DATE_YYYYMMDD:20140326
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