# Join Table tab

Use this tab to specify a mapped column for joining an entity association. By default, the mapping is assumed to have a single join.

This table lists the fields available on the Join Table tab in Properties view for One-to-many mapping and Many-to-many mapping mapping types.

Property | Description | Default
--- | --- | ---
Name | Name of the join table that contains the foreign key column. | By default, the name is assumed to be the primary tables associated with the entities concatenated with an underscore.
Join Columns | Specify a mapped column for joining an entity association. This field corresponds to the `@JoinColum` attribute. Select Override Default, then Add, Edit, or Remove the join columns. | By default, the mapping is assumed to have a single join.
Inverse Join Columns | Select Override Default, then Add, Edit, or Remove the join columns. |

Mapping an entity

Edit Join Columns Dialog