About table

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JPA Doc
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javax.persistence.JoinTable

the mapping of associations. It is specified on the owning side of an association. A join table ... -to-one relationships, and one-to-one associations (both bidirectional and unidirectional). When a join table ... of the join table is assumed to be the table names of the associated primary tables concatenated
FAQ
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What is the Java Persistence API (JPA)?

) is that in JPA data is represented by classes and objects rather than by tables and records as in JDBC ... the relational database (as tables and records) and the representation in the Java application (as classes
Result
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ObjectDB - Object Database for Java (JPA/JDO) [2017-10-19]

database driven application in Eclipse or NetBeans. Forget relational databases, JDBC, drivers, tables ... objects and flat database table rows. Object Relational Mapping (ORM) tools can reduce some manual work
Result
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ObjectDB - Object Database for Java (JPA/JDO)

conversions between graphs of Java objects and flat database table rows. Object Relational Mapping ... relational databases, JDBC, drivers, tables, records, ORM tools and mapping - start writing more effective
Manual
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JPA Query Structure (JPQL / Criteria)

is that SQL works with relational database tables, records and fields, whereas JPQL works with Java ... rather than just field values from database tables, as with SQL. That makes JPQL more object oriented friendly
JPA Doc
14

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 ... column for the map key. The table in which it is found depends upon the context. If the join
JPA Doc
14

javax.persistence.SecondaryTable

javax.persistence Annotation SecondaryTable Target: Classes Specifies a secondary table for the annotated entity class. Specifying one or more secondary tables indicates that the data for the entity class is stored across multiple tables. If no SecondaryTable annotation is specified, it is assumed
JPA Doc
14

javax.persistence.TableGenerator

is specified for the GeneratedValue annotation. A table generator may be specified on the entity class or ... { ... @TableGenerator( name="empGen", table="ID_GEN ... _ID", allocationSize=1) @Id @GeneratedValue(strategy=TABLE, generator
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
JPA Doc
12

javax.persistence.CollectionTable

) Specifies the table that is used for the mapping of collections of basic or embeddable types. Applied to the collection-valued field or property. By default, the columns of the collection table ... Address home; ... @ElementCollection // use default table (PERSON_NICKNAMES) @Column