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GroupBy  
Updated Apr 11, 2011 by Sven.Kro...@googlemail.com

Group-By-Clause

group-by-expression	::=	'GROUP ' 'BY' value-expression

The group-by-clause can be used to cluster results of the select clause to groups. The cluster contains a set of tuples of a selection. The number of tuples can be defined by a numerical value or dynamically by a condition returning a numerical value ( like functions ).

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