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## org.hibernate.annotations
Annotation Type MapKey

    @Target(value={METHOD,FIELD})
    @Retention(value=RUNTIME)
    public @interface MapKey

Define the map key columns as an explicit column holding the map key This is completly different from `MapKey` which use an existing column This annotation and `MapKey` are mutually exclusive

Author:
  Emmanuel Bernard

Optional Element Summary
`javax.persistence.Column[]` | `columns`

### columns

    public abstract javax.persistence.Column[] columns

  Default:
    {}

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