Relational model: all data elements are placed in two-dimensional tables (relations), which are the logical equivalent of files
In the relational model
Each row of a table represents a data entity
( functionally the same as a record )
Columns of the table represent attributes
Domain: the allowable values for data attributes
The Relational Database Model (continued) Figure 3.5: A Relational Database Model Note: In Canada, SSN is called the SIN. It is not legal to require it to be used for identification, except as permitted by law, which is generally limited to identification for the federal or provincial government.