About Group Id

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Manual
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GROUP BY and HAVING clauses

The GROUP BY clause enables grouping of query results. A JPQL query with a GROUP BY clause returns properties of generated groups instead of individual objects and fields. The position of a GROUP BY ... clause. When a GROUP BY clause exists in a JPQL query, database objects (or tuples of database objects
JDO Doc
95

JDO Predefined ID Classes

An object ID is a combination of a persistence capable class and a primary key. It provides a unique representation of a persistent object. The following classes serve as predefined ID classes for persistence capable classes with a simple single field primary key: Object IDs are used in many
JPA Doc
33

groupBy(grouping)

grouping ) Specify the expressions that are used to form groups over the query results. Replaces the previous specified grouping expressions, if any. If no grouping expressions are specified, any previously added grouping expressions are simply removed. Parameters: grouping - list of zero or
JPA Doc
33

groupBy(grouping)

Method javax.persistence.criteria.AbstractQuery AbstractQuery groupBy(   Expression... grouping ) Specify the expressions that are used to form groups over the query results. Replaces the previous specified grouping expressions, if any. If no grouping expressions are specified, any previously
JPA Doc
33

groupBy(grouping)

Method javax.persistence.criteria.AbstractQuery AbstractQuery groupBy(   List grouping ) Specify the expressions that are used to form groups over the query results. Replaces the previous specified grouping expressions, if any. If no grouping expressions are specified, any previously added
JPA Doc
33

groupBy(grouping)

grouping ) Specify the expressions that are used to form groups over the query results. Replaces the previous specified grouping expressions, if any. If no grouping expressions are specified, any previously added grouping expressions are simply removed. This method only overrides the return type
JPA Doc
33

groupBy(grouping)

Method javax.persistence.criteria.CriteriaQuery CriteriaQuery groupBy(   Expression... grouping ) Specify the expressions that are used to form groups over the query results. Replaces the previous specified grouping expressions, if any. If no grouping expressions are specified, any previously
JPA Doc
33

groupBy(grouping)

Method javax.persistence.criteria.CriteriaQuery CriteriaQuery groupBy(   List grouping ) Specify the expressions that are used to form groups over the query results. Replaces the previous specified grouping expressions, if any. If no grouping expressions are specified, any previously added
JPA Doc
33

groupBy(grouping)

Method javax.persistence.criteria.Subquery Subquery groupBy(   Listgrouping ) Specify the expressions that are used to form groups over the subquery results. Replaces the previous specified grouping expressions, if any. If no grouping expressions are specified, any previously
JPA Doc
33

groupBy(grouping)

Method javax.persistence.criteria.Subquery Subquery groupBy(   Expression... grouping ) Specify the expressions that are used to form groups over the subquery results. Replaces the previous specified grouping expressions, if any. If no grouping expressions are specified, any previously added