It occurs when you have a (master) table linking to multiple tables in a one-to-many relationship.
Relates are used mainly to form relationships between tables that have a one-to-many relationship (although they can also be used for one-to-one and one-to-many relationships as well).
In order to find the residential area OF eachblock-group, we need to create a one-to-one or a one-to-many relationship between block group polygons and inhabited polygons.
Join establishes a one-to-one or many-to-one relationship between the destination table and the source table. If you want to establish a one-to-many relationship between the destination table and the source table, ...
One-to-many Relationship: A relation in which one record in a table is related to many records in another table.
 See also: Relation, One-to-many, Model, Information, GIS
  
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