Create a many-to-many table relationship

Create a bi-directional relationship between two tables, so that the related records are visible from both tables in a related list.

Before you begin

Role required: admin.

About this task

Many-to-many relationships allow a list to point to a list of entries, rather than to single field.

If a knowledge base article points to a list of related configuration items, it uses a related list. Not all lists can be used as related lists, however. For a list to be related to another list, a many-to-many relationship that refers to both tables must exist.

The Many to Many Definitions [sys_m2m] table allows administrators to create custom many-to-many relationships.

Many-to-Many tables aren't considered custom tables and don't count toward your custom table allotment.

Procedure

1. In the navigation filter, enter sys_m2m.list.

2. Click New.

3. In the From table field, specify a parent table.

4. In the To table field, specify a child table.

   The Many-to-Many form automatically populates the other fields with suggested values.

5. Edit other field values, if appropriate.

   Note: Many-to-Many table names cannot exceed 30 characters.

6. Reference default many-to-many relationships
   Some many-to-many relationships are defined by default.

Parent Topic:Managing tables and indexes

Related topics

Reference default many-to-many relationships