DB2 9 & 10 for z/OS Overview

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Migration Planning WorkshopOLAP Built-in Functions• RANK– Generates a row number defining the rank as 1 plus the number of rowsthat precede the row.– If two or more rows are not distinct with respect to the ordering, there willbe one or more gaps in the sequential rank numbering. Also referred to asOlympic Ranking.• DENSE_RANK– Similar to RANK but ensures there are no gaps.• ROW_NUMBER– Creates a sequential row number that is computed <strong>for</strong> each row startingwith 1.– No number skipping.• Even though these functions are ordered, cursors remain updatable.32© 2011 IBM Corporation
Migration Planning WorkshopOLAP Function ExamplesROW_NUMBER providesa sequentialnumbering of therowsRANK provides an“Olympic” styleranking of the resultsDENSE_RANK does notskip numbers likeRANK does33© 2011 IBM Corporation
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DB2 9 & 10 for z/OS Overview

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