rank() assigns each row a unique number (rank) giving identical ranking for duplicate
values,leaving a gap in the sequence to the next rank.
dense rank() similar to rank(), it leaves no gaps in the rank after identical ranking.
this link http://www.oracle-base.com/articles/misc/RankDenseRankFirstLastAnalyticFunctions.php
values,leaving a gap in the sequence to the next rank.
dense rank() similar to rank(), it leaves no gaps in the rank after identical ranking.
this link http://www.oracle-base.com/articles/misc/RankDenseRankFirstLastAnalyticFunctions.php
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