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that is a map key. The map key join column is in the collection table, join table, or table ... > annotation is specified, a single join column is assumed and the default values apply. Example 1 ... . If the join is for a map key for an element collection, the foreign

directly, but their content can be added to the SELECT clause by using a bound JOIN variable in the

variables, join and fetch):

to the structure of SELECT queries. DELETE queries cannot include multiple variables and JOIN

that ability and require multiple tables, multiple records and join operations in order to support

a specified set of languages: SELECT c, l FROM Country c JOIN c

variable (with or without an explicit variable name) for iteration. Multiple variables and JOIN are not

backupThread = backupQuery.getSingleResult();     backupThread.join(); // Wait

a primary key column that is used as a foreign key to join to another table. It is used to join the primary table of an entity subclass in the JOINED" title="Enum Constant of javax.persistence.InheritanceType">JOINED mapping strategy

> Defines the three types of joins. Right outer joins and right outer fetch joins are not required to be supported in Java Persistence 2.0. Applications that use RIGHT join types will not be portable.