Explain how linkages between relational tables are accomplished
Tables that are logically related in the data model need to be physically linked. The degree of association between the tables (i.e., 1:1, 1:M, or M:M) determines how the linking occurs. The key-assignment rules for linking tables are discussed below. Where a true 1:1 association exists between tables, either (or both) primary keys may be embedded as foreign keys in the related table.
Where a 1:M (or 1:0,M) association exists, the primary key of the 1 side is embedded in the table of the M side.
To represent the M:M association between tables, a link table needs to be created that has a combined (composite) key consisting of the primary keys of two related tables.
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