About INNER JOIN

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javax.persistence.MapKeyJoinColumn

) Specifies a mapping to an entity that is a map key. The map key join column is in the collection table, join table, or table of the target entity that is used to represent the map. If no MapKeyJoinColumn annotation is specified, a single join column is assumed and the default values apply. Example 1
Manual
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DELETE Queries in JPA/JPQL

cannot include multiple variables and JOIN, and cannot include the GROUP BY, HAVING and ORDER BY clauses
Manual
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JPA Criteria API Queries

, construct). FROM clause (from, join, fetch). WHERE clause (where). GROUP BY / HAVING clauses (groupBy
JPA Doc
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JPA Queries

variables, join and fetch): Other criteria query expressions (for all the query clauses):
Manual
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JPA Query Structure (JPQL / Criteria)

, array, tuple, construct). Criteria FROM (from, join, fetch). Criteria WHERE (where). Criteria
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Online Backup

);     Thread backupThread = backupQuery.getSingleResult();     backupThread.join(); // Wait
Manual
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SELECT clause (JPQL / Criteria API)

can be added to the SELECT clause by using a bound JOIN variable in the FROM clause. Nested path expressions
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UPDATE SET Queries in JPA/JPQL

variable name) for iteration. Multiple variables and JOIN are not supported. The SET clause defines one or
Manual
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WHERE clause (JPQL / Criteria API)

language from a specified set of languages: SELECT c, l FROM Country c JOIN c.languages l WHERE c
JPA Doc
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javax.persistence.PrimaryKeyJoinColumn

get methods) Specifies 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 mapping strategy to the primary table of its superclass; it is used within a SecondaryTable annotation to join a secondary table