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, a full iteration over the Cartesian product is avoided. [ INNER ] JOIN As discussed above, range ... variable: SELECT c1, c2 FROM Country c1 INNER JOIN c1.neighbors c2 In JPQL, JOIN can only appear in a FROM clause. The INNER keyword is optional (i.e. INNER JOIN is equivalent to JOIN ). c1 is declared

How write a query in JPA2 with LEFT JOIN on INNER JOIN ? select a.description, a.id, p1.description ... inner join profile p1 on ap1.id_profile=p1.id and p1.name='?' left join action_profile ap2 on ap2.id_action=a.id inner join profile p2 on ap2.id_profile=p2.id and p2.name='?' where a.id =?;   Thanks

JPA Enum Constant in javax.persistence.criteria.JoinType INNER Inner join . Since: JPA 2.0

, max) - for paging. Query Structure SELECT (including NEW ). FROM (including INNER JOIN , LEFT OUTER ... ( composite ) indices. Collection and array elements are indexable (extremely fast JOIN queries ... optimizations. Configurable JPA eager/lazy fetch  and JPA query FETCH JOIN . Configurable JDO fetch

from: From Since: JPA 2.0 CollectionJoin join ( CollectionAttribute  collection) Create an inner ... an inner join to the specified List-valued attribute. Parameters: list - target of the join Return ... : From Since: JPA 2.0 MapJoin join ( MapAttribute  map) Create an inner join to the specified Map

JPA Method in javax.persistence.criteria.From Join join (    SingularAttribute  attribute ) Create an inner join to the specified single-valued attribute. Parameters: attribute - target of the join Return: the resulting join Since: JPA 2.0

JPA Method in javax.persistence.criteria.From Join join (   String attributeName ) Create an inner join to the specified attribute. Parameters: attributeName - name of the attribute for the target of the join Return: the resulting join Throws: IllegalArgumentException - if attribute of the given name does not exist Since: JPA 2.0

JPA Method in javax.persistence.criteria.From SetJoin join (    SetAttribute  set ) Create an inner join to the specified Set-valued attribute. Parameters: set - target of the join Return: the resulting join Since: JPA 2.0

JPA Method in javax.persistence.criteria.From CollectionJoin join (    CollectionAttribute  collection ) Create an inner join to the specified Collection-valued attribute. Parameters: collection - target of the join Return: the resulting join Since: JPA 2.0

JPA Method in javax.persistence.criteria.From ListJoin join (    ListAttribute  list ) Create an inner join to the specified List-valued attribute. Parameters: list - target of the join Return: the resulting join Since: JPA 2.0

JPA Method in javax.persistence.criteria.From MapJoin join (    MapAttribute  map ) Create an inner join to the specified Map-valued attribute. Parameters: map - target of the join Return: the resulting join Since: JPA 2.0

-valued attribute using an inner join . Parameters: attribute - target of the join Return: the resulting ... a fetch join to the specified single-valued attribute using an inner join . Parameters: attribute ... (String attributeName) Create a fetch join to the specified attribute using an inner join

: should be a top-level class (i.e. not a nested / inner class). should have a public or protected ... is slightly less restrictive: Static nested entity classes are allowed (non static inner classes

the equivalent JOIN query. Entity Type Expressions The TYPE operator (which is new in JPA 2) returns the type ... its subinterfaces ( From , Root , Join and Join 's descendants). Path Expressions The Root and Join interfaces ... Variable Paths: Root country = query. from (Country.class); Join neighborCountry = country. join

. Whenever possible: Use a single Java file with one main class + static inner classes for entity

collection-valued attribute using an inner join . Parameters: attribute - target of the join Return ... ) Create a fetch join to the specified single-valued attribute using an inner join . Parameters ... Fetch fetch (String attributeName) Create a fetch join to the specified attribute using an inner

JPA Method in javax.persistence.criteria.From Join join (    SingularAttribute  attribute,     JoinType  jt ) Create a join to the specified single-valued attribute using the given join type. Parameters: attribute - target of the join jt - join type Return: the resulting join Since: JPA 2.0

JPA Method in javax.persistence.criteria.CriteriaBuilder Join treat (    Join   join ,    Class  type ) Downcast Join object to the specified type. Parameters: join - Join object type - type to be downcast to Return: Join object of the specified type Since: JPA 2.1

JPA Method in javax.persistence.criteria.From Join join (   String attributeName,     JoinType  jt ) Create a join to the specified attribute using the given join type. Parameters: attributeName - name of the attribute for the target of the join jt - join type

JPA Method in javax.persistence.criteria.From MapJoin join (    MapAttribute  map,     JoinType  jt ) Create a join to the specified Map-valued attribute using the given join type. Parameters: map - target of the join jt - join type Return: the resulting join Since: JPA 2.0

JPA Method in javax.persistence.criteria.From SetJoin join (    SetAttribute  set,     JoinType  jt ) Create a join to the specified Set-valued attribute using the given join type. Parameters: set - target of the join jt - join type Return: the resulting join Since: JPA 2.0

JPA Method in javax.persistence.criteria.From ListJoin join (    ListAttribute  list,     JoinType  jt ) Create a join to the specified List-valued attribute using the given join type. Parameters: list - target of the join jt - join type Return: the resulting join Since: JPA 2.0

JPA Method in javax.persistence.criteria.From CollectionJoin join (    CollectionAttribute  collection,     JoinType  jt ) Create a join to the specified Collection-valued attribute using the given join type. Parameters: collection - target of the join jt - join type Return: the resulting join Since: JPA 2.0

variables (bound by an entity class) are represented by the Root subinterface: Join variables (bound by an attribute of a preceding variable in the FROM clause) are represented by the Join subinterface ... and examples. Join Fetch Elements Join Fetch is managed in criteria queries by the following interfaces

JPA Method in javax.persistence.criteria. Join Join on (   Predicate... restrictions ) Modify the join to restrict the result according to the specified ON condition and return the join object. Replaces the previous ON condition, if any. Parameters: restrictions - zero or

JPA Method in javax.persistence.criteria. Join Join on (    Expression  restriction ) Modify the join to restrict the result according to the specified ON condition and return the join ... boolean expression Return: the modified join object Since: JPA 2.1

attribute using an inner join . Parameters: attribute - target of the join Return: the resulting join ... an inner join . Parameters: attribute - target of the join Return: the resulting fetch join Since: JPA 2.0 ... ;attributeName) Create a fetch join to the specified attribute using an inner join . Parameters

JPA Method in javax.persistence.criteria. Join Attribute getAttribute () Return the metamodel attribute corresponding to the join . Return: metamodel attribute corresponding to the join Since: JPA 2.0

JPA Method in javax.persistence.criteria. Join From getParent () Return the parent of the join . Return: join parent Since: JPA 2.0

JPA Method in javax.persistence.criteria. Join JoinType getJoinType () Return the join type. Return: join type Since: JPA 2.0

JPA Method in javax.persistence.criteria.CriteriaBuilder MapJoin treat (    MapJoin   join ,    Class  type ) Downcast MapJoin object to the specified type. Parameters: join - MapJoin object type - type to be downcast to Return: MapJoin object of the specified type Since: JPA 2.1

JPA Method in javax.persistence.criteria.CriteriaBuilder ListJoin treat (    ListJoin   join ,    Class  type ) Downcast ListJoin object to the specified type. Parameters: join - ListJoin object type - type to be downcast to Return: ListJoin object of the specified type Since: JPA 2.1

JPA Method in javax.persistence.criteria. Join Predicate getOn () Return the predicate that corresponds to the ON restriction(s) on the join , or null if no ON condition has been specified. Return: the ON restriction predicate Since: JPA 2.1

JPA Method in javax.persistence.criteria.CriteriaBuilder SetJoin treat (    SetJoin   join ,    Class  type ) Downcast SetJoin object to the specified type. Parameters: join - SetJoin object type - type to be downcast to Return: SetJoin object of the specified type Since: JPA 2.1

JPA Method in javax.persistence.criteria.CriteriaBuilder CollectionJoin treat (    CollectionJoin   join ,    Class  type ) Downcast CollectionJoin object to the specified type. Parameters: join - CollectionJoin object type - type to be downcast to Return: CollectionJoin object of the specified type Since: JPA 2.1

JPA Enum Constant in javax.persistence.InheritanceType JOINED A strategy in which fields that are specific to a subclass are mapped to a separate table than the fields that are common to the parent class, and a join is performed to instantiate the subclass. Since: JPA 1.0

(even from a non persistent class), interface implementations, inner classes, etc. The class members

JDO Annotation Join Target: ElementType.TYPE, ElementType.FIELD, ElementType.METHOD Implemented Interfaces: Annotation Annotation for the join of a relation. Corresponds to the xml element " join ". Since: JDO 2.1 Public Annotation Attributes String column default "" Name of the column in the join

JDO Annotation Joins Target: ElementType.TYPE Implemented Interfaces: Annotation Annotation for a group of joins . Since: JDO 2.1 Public Annotation Attributes Join [] value default null The join definitions used for the mapping of this type. Joins for secondary tables are usually defined

JDO Annotation Attribute in javax.jdo.annotations. Joins Join [] value default null The join definitions used for the mapping of this type. Joins for secondary tables are usually defined at the type ... the same join definition and avoid redundancies. Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations. Join Column [] columns default {} Detail definition of the join column(s). This is needed for more than one join column. Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations. Join String table default "" Table to join to (used when joining to secondary tables). Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations. Join String generateForeignKey default "" Generate or assume a foreign key constraint exists on the column or columns associated with this join . Specify "true" or "false". Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations. Join ForeignKeyAction deleteAction default ForeignKeyAction.UNSPECIFIED Delete action to be applied to any ForeignKey on this join . Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations. Join String outer default "" Whether to use an outer join . Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations. Join String generatePrimaryKey default "" Generate or assume a primary key constraint exists on the column or columns associated with this join . Specify "true" or "false". Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations. Join String unique default "" Whether the join column is unique. Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations. Join String indexed default "" Whether the join column is indexed. Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations. Join String column default "" Name of the column in the join table. Since: JDO 2.1

JDO Annotation Attribute in javax.jdo.annotations. Join String primaryKey default "" Name for a generated primary key constraint. Since: JDO 2.1