JoinFormula (hibernate-core JavaDocs)

```
@Target({METHOD,FIELD})
@Retention(RUNTIME)
public @interface JoinFormula
```
To be used as a replacement for @JoinColumn in most places. The formula has to be a valid SQL fragment

- Required Element Summary
  
  Required Elements
  Modifier and Type Required Element Description
  
  java.lang.String value
  The formula.
- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  java.lang.String referencedColumnName
  The column this formula references.

- Element Detail
  - value
```
java.lang.String value
```
    The formula.
- - referencedColumnName
```
java.lang.String referencedColumnName
```
    The column this formula references.
    
    Default:
    
    ""