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	Group by: list if no aggregate function is specified Group by: list if no aggregate function is specified
	Numbers in JPQL and Criteria Queries >numeric fields. as aggregate expressions - e.g
	count(x) "> Create an aggregate expression applying the count operation.
	countDistinct(x) "> Create an aggregate expression applying the count distinct operation.
	sum(x) an aggregate expression applying the sum operation.
	sumAsDouble(x) ="description"> Create an aggregate expression applying the sum operation to a Float-valued expression
	sumAsLong(x) ="description"> Create an aggregate expression applying the sum operation to an Integer-valued expression
	min(x) an aggregate expression applying the numerical min operation.
	javax.jdo.Query applications to obtain persistent instances, values, and aggregate data from the data store ... must either be an expression contained in the grouping, or an aggregate evaluated once per group
	setResult(data) , this query will return expressions, including field values (projections) and aggregate function ... aggregate functions) to return from this query