Databases and the Data Model : How the Data Model Relates to the Database

How the Data Model Relates to the Database
The Data Model uses complex types, elements, keys and key references from the XML schema standard to represent the database structure. The following table shows how the database structure is represented in the Data Model.
 
The Data Model contains a small amount of information that is not reflected in the database itself:
Computed columns: A column that is populated by a performing a calculation on data in another column. There are three types of computed column. For the first type, you set up the calculation in a code file. For the second type, you use an XPath expression. In the Data Model Editor, computed columns are indicated by a grey computer icon. For the third type you use a SQL expression.
Relationship columns: A column that is populated with data from another table. You can add the relationship column only after you create a foreign key linking the two tables. In the Data Model Editor, computed columns are indicated by a green double-arrow icon.
Related Topics:
The Data Model
Data Sources
The Data Service

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